(This post will be updated over the next few days)
As well as the massive shift in first preference votes from LNP to Labor, a key feature of the 2015 Queensland election has been the shift in preference flows.
With preference distributions now being published, it is possible to begin disaggregating the preference flows.
In 2009, based on preference flows for the final excluded Green candidate in 71 electorates, Green preferences flowed 39.4% to Labor, 17.8% to the LNP and 42.8% exhausted.
In 2012, in the smaller sample of 33 electorates where Green candidates were the final exclusion, preferences flowed 43.3% to Labor, 16.3% to the LNP and 40.4% exhausted.
So far in 2015, in 19 electorates where the same Green preference data is available, the flows are 65.8% to Labor, 11.1% to the LNP and 23.0% exhausted.
On a Green vote of 8.4% statewide, that shift in preferences, an extra 20% flow to Labor, is translating into more than 2% worth of swing to Labor. With all published polls having used 2012 preference flows, it is no wonder that opinion polls underestimated the swing to Labor, even though most were relatively accurate with their first preference votes.
The electorate of Bulimba had three candidates (ALP, LNP, GRN) in both 2012 and 2015. In 2012 the Green preferences were 49.1% to Labor, 15.1% to LNP and 35.8% exhausted. The same figures in 2015 are 69.4% to Labor, 10.1% to LNP and 20.5% exhausted. That's an extra 2-3% on the swing entirely caused by changes in preference flows.
In the Premier's seat of Ashgrove, in 2012 the preferences of all candidates combined were 54.1% to ALP, 18.1% to LNP and 27.7% exhausted. IN 2015 the numbers were 73.5% to Labor, 10.4% to LNP and 16.1% exhausted.
In 2012 there were 71 2-party contests and the overall split of preferences between Labor and LNP was 27.0% to Labor, 22.0% to LNP and 51.0% exhausted.
So far there have been 20 2-party contests reported. The preference flows in those 20 contests in 2012 were 30.0% to Labor, 21.4% to LNP and 48.6% exhausted. The preference in the same 20 electorates in 2015 are 53.5% to Labor, 14.5% to the LNP and 32.0% exhausted.
On first preferences the LNP led in 51 seats to Labor's 35, but Labor has won 44 seats to the LNP's 42. Labor has come from behind to win in nine electorates. Those electorates are Barron River, Brisbane Central, Bundaberg, Ferny Grove, Maryborough, Mount Coot-tha, Mundingburra, Pumicestone and Springwood.
After a decade in which the number of voters showing preferences has declined consistently, in 2015 the trend has reversed. While the LNP continued to recommend 'just vote 1', both labor and the Greens moved back to recommending lists of preferences in most seats, and the union movement ran a strong 'Put the LNP last' campaign.
It looks like those preferences recommendations, and the decisions of voters themselves to number more squares, have been the difference between Labor winning the 2015 election and the LNP being returned.
On my back of the envelope calculations, Labor has won Bundaberg, Ferny Grove and Springwood on the extra preference flows. That's the difference between Annastacia Palaszczuk and Lawrence Springborg forming the next government of Queensland.
(I'll re-do these calculations in future days.)
So optional preferential voting is not 'de-facto first past the post' as some dismiss it. Preferences can still make a difference.
Come the NSW election in March, there will be much interest in whether Labor and the Greens move away from the just vote 1 how-to-votes they issued in 2011.
If they do, the Queensland experience shows it could tilt the balance against the Baird government in some key seat, and could make a difference to the final seat in the Legislative Council.
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