FIRST WAVE LIB 32.3 ALP 28.7 GREEN 14 IND 19.2 NAT 1.8 OTHER 3.9
SECOND WAVE LIB 34.5 ALP 28.2 GREEN 13.9 IND 17.8 NAT 2.1 OTHER 3.5
ELECTORAL, POLLING AND POLITICAL ANALYSIS, COMMENT AND NEWS FROM THE PEOPLE'S REPUBLIC OF CLARK. HOORAY FOR THE TASMANIAN NATIONALS FOR FINALLY GIVING ME AN EXCUSE TO MENTION THE BILDERBERG GROUP ON HERE. IF USING THIS SITE ON MOBILE YOU CAN SCROLL DOWN AND CLICK "VIEW WEB VERSION" TO SEE THE SIDEBAR FULL OF GOODIES.
Oh no, not again ... |
The day after the 2025 federal election it was obvious something had gone astray with polling again, and by something near the same amount, but the media reception was muted. I think I did only one interview where the polling was even part of the report's initial focus. The ABC did an article about the polling, but it was so quarter-arsed that it omitted four final polls, initially got the 2PPs of four others wrong, and even when "corrected" continues to this day to contain errors about what the final poll 2PPs were. There were a few other articles that were better.
When there's a general polling failure (polling picking the wrong winner) that's big news, especially if polls picked the left to win, because that plays into the outdated (and always overrated) "Shy Tory" myth about voters frequently lying to pollsters. When there's just a general polling error (polling picking the correct winner but with a large miss on the margin) hardly anyone cares, especially if polls picked the left to win (see New Zealand 2020, a worse miss than Australia 2025). Even I have been so bogged down in the extraordinary Reps postcount followed by yet another snap election in my home state that it's taken me this long to write anything detailed about the second-worst set of Australian final polls in the last 40 years. This wasn't quite as bad as 2019 and there were some bright spots - but it wasn't that much better either. (This said, by global standards 2025 wasn't terrible. On the major party primary vote gap - which is the international standard for polling errors - it's just an average error, but Australia is used to better.)
A brief note on 2PP conventions for this article. Whether the 2PP was really 55.22 to Labor (the AEC's official figure) or 55.26 to Labor (my estimate accounting for the Bradfield situation, re which more soon) has no real impact on the conclusions or rankings here, since everyone was below that 2PP. However, for the time being I use the AEC's figure. In the event of the AEC releasing figures for Bradfield calculated by the normal methods later, I may edit this article to include a revised figure.
Final polls
In a very richly nationally polled election ten pollsters ended up releasing a final poll. This included two pollsters that had not released any other leadup voting intention polling, one of which was previously unknown to me.
Pollsters are judged a lot by final polls, but final polls are only a single poll (so there's a degree of luck involved as to whether it's a good one), and final polls are taken at the time when there is the most data around for any pollster who might be tempted to herd their results in some way to base such herding on. However, the final poll stage is the only stage where, at least in theory, there's an objective reality to measure the poll against. A poll taken a few days out from election day should have a good handle on how people will vote, even more so these days when so many people have already voted by that point. Any attempt to determine the accuracy of polls taken well before election day requires much more debatable assumptions (but even so, a seat poll taken a month out shouldn't be wrong by double digits).
It's also important to note that often which poll comes out as the most successful depends on how you choose to measure it. A few comments going into the following table:
1. I consider 2PP estimates to be a very important part of the polling service in Australia and therefore weight them heavily in my assessment of pollster performance. This was another election at which, for all the trendy nonsense about the demise of 2PP, two-party swing overwhelmingly determined the shape of the outcome. Labor gained very slightly more seats than the 2PP pendulum predicted for the 2PP swing they got, and the other net changes (three Labor gains from the Greens and one net Independent gain from Coalition) were very minor. Two of the three Labor gains from the Greens were also predictable in advance if one knew the national primary vote swings.
2. YouGov released a final MRP and a final public data poll. The final MRP got far more attention but a poll taken from 1-29 April, where the pollster later released a poll taken 24 April-1 May, should not be considered a final poll. I include it in the table but not in the rankings, and cover it separately.
This article is part of my 2025 Tasmanian election coverage. Link to main guide page including links to seat guides and voting advice.
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Something bubbling away in the state election campaign which I have so far avoided writing a full article on is the alleged controversy (and I don't believe the claims really have any merit) about Franklin Labor candidate Jessica Munday's eligibility to be elected. However the appearance in today's Mercury (and also now Pulse) of a claim that the entire election might have to be voided and rerun over this is something that I think I should comment about. Advance summary: no. I also thought this was a good opportunity for a general article about ineligibility in Hare-Clark elections and what can be done about it if it occurs.
The debate concerns Munday's unresigned membership at the time of nomination of the WorkCover Tasmania board. The Liberal Party maintains that Munday is ineligible under Section 32 of the Constitution Act 1934 (effectively the Tasmanian Constitution) which states:
(1) Except as otherwise expressly provided, if any Member of either House shall acceptany pension payable, out of the Public Account, during the pleasure of the Crown or anyoffice of profit or emolument by the appointment of –(a) the Governor or the Governor in Council; or(b) a State instrumentality –his seat shall thereupon become vacant.(2) The provisions of subsection (1) do not apply to a person by reason only that heholds the office of Minister of the Crown or Secretary to Cabinet for this State.(3) No judge of the Supreme Court, and no person holding any office of profit oremolument to which the provisions of subsection (1) apply, shall be capable of beingelected to, or of holding, a seat in either House.
2. Employees in employ of State may be elected to Parliament(1) Nothing contained in subsection (3) of section 32 of the Constitution Act 1934 shall extend to any person otherwise qualified who holds any office of profit or emolument in the public service of the State, or in any business or undertaking carried on by any person, body, or authority on behalf of the State.(2) Any person to whom subsection (1) applies shall –(a) forthwith on being elected to a seat in either House of Parliament cease to hold such office; and(b) be entitled to leave of absence for a period not exceeding two months for the purpose of contesting a Parliamentary election, but shall not be entitled to any salary during his absence from duty for that purpose: Provided that this paragraph shall not affect any right of any such person to leave of absence under any Act or any regulations or by-laws thereunder.
Munday is not a state public servant under the provisions of what is now the State Services Act 2000. She is a "crown servant" appointed by the Governor to serve the State on the advice of the relevant minister. The question is whether her position is an "office of profit or emolument [..] in any business or undertaking carried on by any person, body, or authority on behalf of the State". In the event that it is, as it would seem to very obviously be on a plain English reading of the clause in isolation, there is no problem at all and the entire thing is a massive beatup. The heading of the section suggests it refers to "employees", but a legally qualified colleague has pointed me to Section 6 (4) of the Acts Interpretations Act 1931 which says that headings to provisions are irrelevant. The State Services Act 2000 itself has intepretations under which such boards are state authorities, however those interpretations are for the specific purposes of the State Services Act 2000. My assumption is that Munday is eligible, pending any clear evidence otherwise.
The legal opinion that the Liberal Party has obtained from barrister Chris Gunson SC explains in detail how Munday meets the definition in Section 32 of the Constitution Act 1934 but unfortunately it does not comment at all about Labor's defence or even display an awareness that Labor has raised it. I would have expected if the Liberals were seriously interested in proving Munday to be ineligible rather than spreading some FUD and getting a few headlines then they would have ensured the defence was addressed in the advice. It would be interesting to see if the Liberal Party has any legal advice about Labor's defence or if for that matter Labor will release advice on the issue. Munday herself has advice from a former Solicitor-General that she is eligible. [Update: this advice is now covered here - the advice is by Michael O'Farrell SC. O'Farrell specifically references the 1944 Act and says that he does not think "there can be any doubt that the WorkCover Board is engaged in an undertaking, and carries that out as a body or authority on behalf of the state". I have not yet seen the full O'Farrell advice.]
The rest of this article isn't written to take seriously the idea that Munday is ineligible. It's written because the general matter of what happens if someone is ineligibly elected in Hare-Clark is a matter that hasn't had much attention, and this is a good example to talk about as it involves a candidate who at this stage might or might not be elected.
Consequences of ineligibility: if candidate won
In federal elections the matter is well settled. If a member of the House of Representatives is ineligibly elected then the solution is a by-election and the ineligible member can recontest if they are now eligible. If a Senator is ineligibly elected then the solution is a special count at which the entire Senate count for the state or territory is redone without the ineligible Senator, typically electing the next candidate down on their party's ticket. This excludes the disqualified Senator until the next election, unless they get appointed on somebody else's casual vacancy.
However for state elections conducted under Hare-Clark the answer is complicated by a lack of precedents and court rulings. This situation last arose in 1979 when various elected MHAs were accused of breaching spending caps that existed at the time, resulting in challenges initially against everyone elected in that election that were later narrowed down to challenges against three Labor MHAs in Denison (now Clark) and four in Bass. Ultimately the three Labor MHAs in Denison (John Devine, John Green and Julian Amos) were found to have breached their spending caps and to have been ineligibly elected.
The result was a by-election for all seven seats in Denison, not because the court had directed such but because the Parliament had passed the Electoral Amendment Act (No 2) of 1979. This Act held that if a single member in a division was ineligible to be elected, their seat would be vacant and a single-member by-election would be held for that seat. But if more than one member of a division was disqualified, the entire division would be voided and a seven seat by-election held. This led to the Denison by-election of 1980, at which Devine and Amos won their seats back but Green lost out to Democrat Norm Sanders. (One of the sitting Liberals also lost their seat to another Liberal).
As Devine, Amos and Green were all seated in parliament while the challenge to their seats was heard, they were in fact able to vote (and did vote) on the legislation that made this solution possible, which the Liberal Opposition opposed. The Government's argument was that for a member who had breached a salary provision to be excluded from parliament for up to four years with no prospect of recovering their seat was an unreasonable penalty. They also argued that recounts of any kind were not a fair solution since in Bass if they lost four MPs they would run out of MPs to contest the recount and lose a seat, and of course a mult-seat by-election for just the voided seats would make it impossible for Labor to recover them all. In the end only the three Denison seats were voided, not the four Bass seats.
The Electoral Amendment Act (No 2) of 1979 expired at the end of 1980 so there is now no enacted rule in place for dealing with a disqualification. This all highlights that if an ineligible candidate ever does win again the Parliament (via legislation passed through both houses) has scope to determine how to fill the vacancy before the court makes a decision; the court is not necessarily going to just declare the whole seven-seat contest for that seat void. Possible solutions would include:
1. a recount of the excluded member's seat as if it were a casual vacancy (but I would argue that this is a bad solution since it rewards the party that ran the ineligible candidate by ensuring they retain the seat)
2. a recount of the whole election with the excluded member removed from the count as if they had died between nomination day and polling day (the risk although small is this might unelect someone who was validly elected at the first election)
3. a single seat by-election, but this would be unfair if the vacating member was from a minor party
4. a whole-of-electorate by-election.
Even if left to its own devices, it is not obvious to me that the court would choose solution 4 as opposed to declaring a different candidate elected following solutions 1 or more likely 2 (the Court has no power to order solution 3 of its own volition, but could declare a vacancy that activated solution 3 if there was legislation allowing it to do so). We already know that the High Court has so far chosen solution 2 over solution 4 when an ineligible Senator is elected, a situation that had not come before the High Court in 1979. The 1979 decision by Parliament does not set any precedent that the Court would be required to follow, least of all because the Parliament specified solution 3 not solution 4 as the remedy for a single member being disqualified.
Consequences of ineligibility: if candidate lost
The opinion the Liberal Party has obtained also suggests that even if Munday is not elected but found to have been ineligible, the Court of Disputed Returns might invalidate the contest for Franklin and send all seven elected Franklin MPs to a by-election. This in my view is very unlikely - but it could in an edge case depend on the mechanics of the count. As I noted in comments re the NT case Hickey v. Tuxworth (1987) 47 NTR 39 there has been an example in Australia of a seat being voided because an ineligible candidate stood and was defeated. However the High Court has since severely criticised the reasoning, especially on the grounds that voiding elections because somebody ineligible ran and lost would "play havoc with the electoral process". Ineligible candidates - dozens of whom run at every federal election as it is - could then run just to try to get a seat voided even if they had no chance of winning. Perhaps a court would do something about an ineligible candidate losing in a case where reallocating their votes as if they had died between nomination and polling day resulted in a different list of winners to the actual election, but otherwise (and even in such a case) I doubt the court would go there.
Voiding of the whole election?
The opinion obtained by the Liberal Party raises the spectre of the entire 2025 election being voided and rerun if a prominent candidate was found to be ineligible, supposedly on the grounds that their presence and activity in the state campaign has somehow contaminated the choice of voters in other divisions regarding their own representatives. The opinion suggests that whether or not this could be a thing would be determined by "necessary facts" as yet unknown - Munday's involvement in the campaign and analysis of the results in the other seats. It is totally unclear to me - and no mechanism is cited - how any level of an ineligible candidate's involvement in the campaign in other seats, or any results in other seats, could result in a different seat being voided. After all people who are not eligible to be, or even attempting to be, elected to any seat will campaign in seats all the time.
I am very confident that if this was even remotely a thing there would have been precedent by now as there have been so many cases involving ineligible MPs and there is not, at least not in Australia. In 2016 the Liberal-National Coalition was narrowly returned with an ineligible Deputy Prime Minister but when his ineligibility was discovered (albeit long after the close of the window for public challenges to the results) there was no suggestion that the Parliament should refer at least all the other National Party members and Senators to the High Court. "Your Honours, the member for Gippsland was never eligibly elected because his win was infected with Barnaby's Kiwi germs!" (The language of the Electoral Act 2004 may give the lay impression that the Court of Disputed Returns would consider voiding an entire state election but in this context an "election" is an election for one of the five divisions.)
The idea that the Court could void an entire state election on the grounds of a single candidate's eligibility is in my view beyond absurd. There are very many cases where voters might vote for a party under impressions about which candidates running in different seats might be a member of that party's government, but those impressions might be wrong for any number of reasons that might or might not be the fault of the party that endorsed the candidates (including simply that the candidates might lose). It's only two elections (which is only just over four years, sigh) ago that Adam Brooks resigned his Braddon seat hours after being (eligibly) elected following multiple scandals. There were claims that the Liberal Party were not running Brooks as a serious candidate and were just running him as a profile-harvester, and never intended that he serve a full term. Voters might vote for parties in a seat based on all kinds of other false pretences created by the party (broken promises for starters!); there is never any end to contentious judicial interference in elections if one thinks that other seat contests should be voided over this stuff.
I may add more comments later.
This piece is part of my Tasmanian 2025 election coverage - link to 2025 guide page including links to electorate guides and other articles.
This piece is written to explain to voters how to vote in the 2025 Tasmanian election so their vote will be most powerful. It is not written for those who just want to do the bare minimum - if you just want to vote as quickly as possible and don't care how effective your vote is then this guide is not for you. It is for those who care about voting as effectively as possible and are willing to put some time into understanding how to do so. This is very near to being a carbon copy of my 2024 guide but I have put it out as a 2025 edition with some very minor changes tailored to this year's election.
Please feel free to share or forward this guide or use points from it to educate confused voters. If doing the latter, just make sure you've understood those points first! I may edit in more sections later.
Please do not ask me what is the most effective way to vote for a specific party, candidate or set of goals as opposed to in general terms.
Oh, and one other thing. Some people really agonise about their votes, spend many hours over them and get deeply worried about doing the wrong thing. Voting well is worth some effort, but it's not worth that. The chance that your vote will actually change the outcome is low.
Effective Voting Matters!
I'll give a recent example of why effective voting matters. In 2021 the final seat in Clark finished with 10145 votes for Liberal Madeleine Ogilvie, 9970 votes for independent Kristie Johnston and 8716 votes for independent Sue Hickey. As there were no more candidates to exclude at this point Hickey finished sixth while Ogilvie and Johnston took the last two seats. Had the two independents had 1606 more votes in the right combination, Ogilvie would have lost instead, and the Liberals would not have won a majority. But during the count, 2701 votes had been transferred from Labor and Green candidates to "exhaust". All these were voters who did not number any of Ogilvie, Johnston and Hickey. Many would have voted 1-5 for Labor and Green candidates (mostly Labor) and then stopped. There were enough votes that left the system because voters stopped numbering that the outcome could have been different.
That's not to say it would have been had everyone kept numbering - the voters would have had to somehow sense that Hickey needed preferences more than Johnston, or else the flow to the two independents would have had to be extremely strong (which wouldn't happen). But it is possible for voters who choose to stop numbering to cause the election of parties they would not want to win. And now we have seven seats per electorate, it's probably more of a risk than it was in the old five-seat system.
Some of these voters would have stopped because they didn't care about other candidates - but I suspect most really would have had a preference. Most of those stopping most likely stopped because they didn't realise they had the potential to do more with their vote, or because they couldn't be bothered.
There Is No Above The Line / Below The Line
Tasmania does not have above the line party boxes in state elections. All voters vote for individual candidates and decide how many preferences (if any) to give beyond the required seven, and which parties or candidates if any to give their preferences to. There are no how to vote cards. Your most preferred party may recommend you put its candidates in a particular order but you don't have to follow that. While a lot of voters will vote 1-7 all for the same party, plenty of voters vote across party lines for a mix of different candidates.
Your Party/Candidate Doesn't Direct Preferences
Your preferences go only where you send them. There is no such thing as your candidate giving preferences to other candidates. You do not have to worry about the candidates you vote for possibly "sending" preferences to someone you don't like because you say where your vote goes.
If you vote 1 to 7 for a party and stop, your party does not decide what your vote does next once all your party's candidates have either won or lost. At this point your vote plays no further role in the election. Your vote can only even potentially play a role between other parties if you make it do so. The same applies if you vote for seven candidates across party lines, or for seven independent candidates. Your vote can only do the work you tell it to do. If you just vote for one party but think some other candidates are OK while some are terrible, your vote does not reflect that.
There Is No Party Ticket
Unlike the Senate, candidates do not appear in a specific order on the ballot; the parties appear in a specific order for each seat but the candidates within each party's column are rotated. There is therefore no number 1 Liberal or Labor candidate in each seat. The Greens put out recommended how to vote orders but these are only a recommendation and the voter can just as easily put the candidates in their own preferred order.
You Cannot Waste Your Vote! (Sort-Of)
The idea that voting for minor parties or independents that won't get in or form government is a "wasted vote" is an evil and pervasive myth smuggled in from bad voting systems where it's actually true (like first past the post). Some major party supporters spread this myth, including in Hare-Clark, to try to scare voters off voting for anyone else. In Tasmanian elections if you vote for a candidate who is not elected, your vote flows at full value to the next on your list and so on. You can't waste your primary vote except by not casting a formal vote - but you can waste your preferencing power by stopping early. If your vote only numbers a limited number of candidates then once all those are excluded or elected, your vote might hit the exhaust pile and be a spectator for all the remaining choices. If the candidate you like the most is from a minor party or is an independent, ignore anyone who tells you voting for that person is a "wasted vote". They're wrong.
Make Sure Your Vote Counts - No Mistakes In First 7
A vote must include at least the numbers 1 through 7 without mistake because our politicians are not committed to protecting voters from losing their votes as a result of unintended errors. Do not use ticks or crosses. If you number six boxes and think you just can't find a seventh candidate and stop, your vote won't count at all. If you're one of those people who starts at the top then goes to the bottom to number all the boxes and works up, and you accidentally end up with two 6s, that will not count either. When you have finished your vote check carefully to make sure you have the numbers 1, 2, 3, 4, 5, 6, 7 each once and once only. (Also check that you have not doubled or omitted any later numbers, but that's less critical, as if you have your vote will still count up to the point of the mistake.) If you make a mistake while voting at a booth you can ask for another ballot paper.
Some voters try to number the candidates from each party column separately, so they rank the Labor candidates from 1-7, the Liberal candidates from 1-7, the Green candidates from 1-7 etc. If you do this your vote does not count. You are ranking all the candidates together. Each number you use should appear once only on the whole ballot paper.
Voters for the Nationals in Lyons and the Martin independent group in Braddon should be especially careful here. If you vote 1-5 for the Nationals in Lyons, or 1-6 for the Martin group in Braddon, and then stop, your vote will not be counted.
Be especially careful with keeping numbers in sequence when moving from one column to another as that is when mistakes often occur.
The Gold Standard - Number Every Box
The most effective way to vote is to number every box. That means that your vote has explained where you stand on every possible choice between two candidates and there is no way that your vote can ever leave the count while there are still choices to be made.
But doesn't this help candidates you dislike? This is a common myth about the system. By numbering all the way through, if you've numbered a candidate you dislike and your vote reaches them, it can only help beat candidates you dislike even more! The reason for this is that every candidate you put above the mildly disliked candidate must have already won or lost before your vote can get there. If your vote reaches that point then one of the candidates you dislike is going to win no matter what you do. You may as well make it the more bearable one and use your vote to speak for the lesser evil.
In terms of the primary election you can stop when you've numbered every box but one, and it makes no difference. But because of a weird quirk in the recount system, numbering every box could help your vote to have a say in a recount for your worst enemy's seat!
Numbering every box takes some preparation - it is best to plan your vote before you go to the booth, There are sometimes automatic tools to help with this and if I see any I'll link to them here.
The Silver Standard - Number Everyone You Can Stand
If you don't want to number every box then a lower-effort alternative that is still better than numbering 1-7 and stopping is to number all the candidates/parties who you think are good or on balance OK and that you have some idea about. That at least means your vote will never leave the count while candidates or parties who you think are at least so-so are still fighting with the baddies.
I Don't Care Who Wins But I Want Someone To Lose!
Then number all the boxes and put that party and/or person last. You may also find the strategic voting section interesting in this case. You can never help a candidate to win by putting them last.
Minor Exceptions
An exception to the gold standard is if you reach a point where of the candidates you have not numbered, your response to any choice between them is that you absolutely do not care. If you get to that point, and you've numbered at least 7, it's safe to stop. (That said I would keep going and randomise my remaining preferences at this point, for potential recount reasons.)
Another one is if you slightly prefer one party to another but are so disappointed with the first party that you want to send it a message by not preferencing it, in the hope it fights harder for your preference next time. In that case you can also stop (if you've numbered at least 7 boxes), but in this case you should tell the first party that that's your view (anonymously if you prefer); otherwise they will have no idea you felt that way.
Who Are These People?
Numbering every box is hard work - who are all these people? I write guides about elections and even I know nothing about lots of them! If you've never heard of a candidate and they're not running for a party that you like, I'd recommend putting them between the candidates you dislike slightly and those you're sure you cannot stand. Even if they're running for a party you like, it may be worth doing some research because sometimes parties preselect candidates they shouldn't. Ultimately it is up to the candidates to make themselves known to you. If they haven't done that, you are entitled to penalise them.
What Is Group B, Group E and So On?
Some independent candidates have registered their own columns so they stand out on the ballot paper, while others are just listed in the ungrouped column on the far right of the ballot. In this year's election both these kinds of candidates have the same status, it's just that some of them have lodged 100 signatures either by themselves or as a group to stand out more. If a candidate is a party candidate you will see their party name. The group letter names for some independents just refer to their position on the ballot paper; the "Group B" independents in various electorates are not connected to each other just because they have the same group letter.
Are These Candidates In This Group That Isn't A Party Connected?
There are two non-party groups running multiple candidates this year - the group including Adam Martin (Group B) in Braddon and the group including Peter George (Group C) in Franklin. The Braddon group are a bunch of independents who have chosen to run together, who have some common viewpoints but may have quite different views on many things. The Franklin group are not a formal party but are said to be much more tightly aligned to each other based on a set of common principles.
Then there are the ungrouped columns on the right hand side of the paper. In general, the candidates in the ungrouped column are independents who do not have anything to do with each other (an exception is Gatty Burnett and Mellissa Wells in Braddon who are running together). A few ungrouped independents are actually members of parties that are not registered to run in state elections. Independents in the ungrouped column may have very different views to each other.
How Does Your Vote Work? Why Your Number 1 Matters
This is not the place for a full account of how Hare-Clark voting works, there's one here. There's a common misconception that when you vote for seven candidates the order doesn't matter much because your vote will help them all. In fact, that's often not true and your vote only helps one candidate at a time, and helps them in the order you put them in. Who you vote 1 for can be very important. If your number 1 candidate is excluded then your vote flows on to the next candidate who is still fighting for a spot at that stage at full value. If your number 1 candidate is elected straightaway with over 12.5% of the vote in their own right, part of your vote's value is used on helping them to win, and part flows on to other candidates you have numbered. If your number 1 candidate doesn't win off the first ballot but never gets excluded, then all your vote's value goes to helping your number 1 candidate either eventually win or at least try to (if they finish eighth). For this reason it's not just who you choose as your first seven that matters, but also the order that you put them in.
That ends the main part of this article, and the rest is something specialised I threw in because ... people do ask.
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Special Sealed Section: Strategic Voting (Advanced Players Only!)
This section is an optional extra and is rated Wonk Factor 4/5. If you read it and are not sure you understood it, pretend you never read it and certainly don't try explaining it to anyone else!
Most voting systems are prone to tactical voting of some kind; indeed, in some it's necessary. Under the first-past-the-post system in the UK it is often necessary for voters to vote tactically for their second or third preference party to ensure their vote isn't "wasted". In the 2022 federal election, some left-wing voters voted 1 for teal independents because they were more likely to win from second than Labor or the Greens were. Our preferential systems are much fairer than first-past-the-post, of course, but there are still ways of voting that can make your vote less than optimally powerful, and ways to get around that if you want.
In this case I am not arguing that voters should vote tactically - I'm just explaining how they can do it if they want to. The ethical decision involved (since voting tactically effectively reduces the value of other voters' votes) is up to them. There's also a problem with tactical voting in that if everyone did it it would stop working and create bizarre outcomes. (But no one should let that alone stop them, because that will not actually happen. Immanuel Kant was wrong about everything.)
The scope for tactical voting in Hare-Clark is mainly around quotas and the way the system lets votes get stuck. One simple principle of effective tactical voting for those who want to do it is to not vote 1 for any candidate who you know or strongly suspect will be elected straightaway.
Suppose I am weighing up between these three candidates, whose surnames indicate their voting prospects: Morgan Megastar, Nico Nohoper and Lee Lineball. And I decide they are my equal favourites. Morgan always polls a bucketload of votes and will probably be elected in their own right, or at least will surely win. Lee might get in off the first count, on a good day, but I don't really know if they'll win at all, and Nico has run in 17 elections and got two deposits back but I like them anyway. Now in this situation I will vote 1 Nico 2 Lee 3 Morgan (and I will then number all the other boxes).
Why? Because I know Morgan doesn't need my #1 vote. If they get it and they're elected at the first count, the value of their excess votes is one vote greater, but that vote won't all be mine. A part of the value of my vote stays with them and the rest of it flows on to other candidates, but I've also slightly increased the value of all their other votes to make up the difference. And these could be votes cast by Hung Parliament Club op-ed writers or other witless philistines. I'd rather have my vote flow on at full value! Also, Morgan might not quite get quota on the first count, and in that case my vote never goes anywhere else, and I might be boosting whatever vote detritus does put them across the line (shudder!) There is even an extremely rare scenario here where by voting 1 for Morgan I could boost the votes of Lee's key opponents to the point that it actually harms Lee.
So I vote 1 for Nico Nohoper. A few counts in Nico will be excluded, again, by this stage Morgan is already over the line, or will be soon, and now my vote flows at full value to Lee who may need it. And if Lee eventually gets eliminated, it will flow on at full value to #4, and so on. I do this sort of thing a lot - among my top five or six candidates I will often put them in order from least promising to most, so that my vote will hang around a while and might even be able to flow on past all those candidates at full value. But it takes a lot of knowledge of who is likely to poll well (or not) to pull it off.
One can get carried away with this idea and try to thread the needle in an order one doesn't support (eg candidates one dislikes above candidates one likes) to try to get one's vote still on the table at full value at #30 in Franklin trying to defeat You Know Who. I call this "quota running" and I really don't recommend it. It's too easy to fail to predict something that happens in the count and wind up with your vote doing something that you don't want. Most likely your vote will never get that far anyway.
And there's another thing worth knowing here. Suppose I'm tossing up at some point between two similar candidates who I think will both be contenders, but I really do not have a view between them. This could happen if I was a major party voter, but it could also be two leading indies. Now in this case I could go for the one I think will poll less well. Why? Because this increases the chance that both of them stay in the count and can both beat a single candidate from some other force (aka the Ginninderra Effect).
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