Unintended Informal Voting In Tasmanian State Elections

Advance Summary

1. In Tasmanian state elections for the House of Assembly, any vote that fails to have the numbers 1-5 each once and once only is ruled informal and does not count.

2. A Bill to expand the Tasmanian House of Assembly would result in this being changed to 1-7. This would be likely to increase the rate at which voters voted informally by mistake.

3. The current rules very slightly advantage the Greens over other parties, especially Labor and most fourth parties and independents.  However, this hasn't decided any contest for a seat between parties in the last 30 years.

4. It is plausible that requiring voters to fill seven boxes without error would further increase the advantage for some parties over others, however the evidence on this is insufficient.

5. Unintended informal votes where a voter mistakenly omits or doubles numbers could be included in the count using a savings provision system already used in the ACT.

6. The view that the ACT system causes massive exhaust rates compared to Tasmania is based on a misunderstanding of the ACT computer counting system, which continues to distribute votes, creating spurious exhaust, after contests are actually over.

7. The ACT system may even help address exhaust issues partly by discouraging minor parties from needlessly running full slates of candidates.

8. Including more votes makes elections more inclusive!  We should do it. 

ReachTEL - State Labor Back To The Lifeboats

ReachTEL (Tas State): Lib 52.5 ALP 19.7 Green 15.6 Other 6 Undecided 6.3
Interpretation: Lib 57 ALP 22 Green 17 Other 4 (Other perhaps higher)
Outcome based on this poll "if election was held now": Liberal Victory (c. 15 seats)
Projection based on all polling: 14-8-3

We have reached a useful milestone in Tasmanian polling since, for the first time since the last state election, EMRS has competition from another poll that is commissioned by the media and that is not merely an internal poll released by the party.  Historically it has been a long time since we have seen public polling by someone other than EMRS, apart from during an election campaign.  Indeed, the Mercury-commissioned ReachTEL is to my knowledge the largest poll of state voting intention ever conducted in Tasmania.

These are the headline figures, which I'll discuss after a small but important diversion:

Tasmanian Lower House: 25 or 35 Seats?

This article has been updated for elections from 2014 to 2025. Scroll down to the bottom for these updates.

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Advance summary (pre-2014 version):

1.  The possibility of restoring the old 35-seat system in the Tasmanian House of Assembly is currently being discussed ahead of a motion to be moved by the Greens.

2. Looking at past election results and current polling, the 35-seat system is slightly more proportionally accurate, while the 25-seat system is slightly more prone to "over-represent" the major parties in comparison to vote share.

3. However, precise proportional representation in the Tasmanian context can easily be argued to be overrated anyway.

4. Of the elections considered (and a 2014 projection based on current polling), only in the case of 1998 did the choice of systems determine the election result.

5. Majority government is slightly more likely on average with 25 seats than with 35 seats, but in many scenarios the number of seats makes no real difference to its chances.

6. Strategic considerations favour the Greens supporting an increase in the number of seats and the Liberals opposing it, while for the Labor Party there are arguments on both sides.

7. The view that the Greens could plausibly win more seats than Labor at the next election if the 25-seat system is retained is not consistent with current polling.

8. It is not correct to blame too many problems in Tasmanian politics on the 25-seat system since politics under the 35-seat system was also very turbulent and crisis-prone during its last two decades.