New Zealands election is coming down to a simple contest between the Labour-Green bloc on the left and the National-ACT bloc on the right. Although the right is behind in the polls, if it were to gain the majority, ACT Party leader David Seymour could become deputy prime minister.

Either way, ACT is newly assertive. Although Seymour owes his Epsom seat to Nationals grace and favour, he seems less inclined nowadays to be their political lapdog. He wants people to support ACT on its own terms.

Remarkably, the party has risen in opinion polls from below 1% to recently as high as 8%. That would give ACT up to ten seats in parliament. Would Seymour also negotiate to bring one or more first-time MPs into cabinet alongside him?

In the past two elections, ACT held on with only one electorate seat, thanks to the National Party deal: Epsoms National supporters agree to vote for the ACT candidate as their local representative but give their party vote to National.

This arrangement goes back to 2005. It paid a handsome dividend in 2008 when ACT won Epsom and achieved 3.65% in the party vote. This delivered the party a proportional share of five seats, despite being below the 5% party-vote threshold.

With ACTs support on the right, and two other parties in the centre, John Key formed a National-led government that lasted three terms. Then ACTs party vote fell below 1% in 2014 and 2017, with only the Epsom seat keeping it in parliament.

In 2020, however, after a term in opposition and no longer overshadowed by National, ACT is flourishing again.

Seymour has held his own, speaking up for freedom of speech and opposing the banning of semi-automatic guns following the mosque shootings in March 2019. He introduced a members bill to permit euthanasia that is likely to come into force after a decisive referendum to be held alongside the general election.

However, National leader Judith Collins has bluntly stated she sees ACTs job as being to win Epsom and to help eliminate the populist New Zealand First Party, which on recent polling is likely to be ousted from parliament on October 17.

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ACTs rise in the polls does come partly from those conservative erstwhile New Zealand First voters who are disillusioned with Winston Peters for forming a coalition government with Labour.

But Collins must be worried that some centre-right voters have given up on National winning and are exercising their freedom of choice by defecting to ACT and she wants them back.

The Association of Consumers and Taxpayers was founded in 1993 by former National cabinet minister Derek Quigley and Sir Roger Douglas, formerly minister of finance in David Langes Labour government and engineer of the economic deregulation that became known as Rogernomics.

The party stands for less government, more private enterprise and freedom of choice. It is therefore a child of neoliberalism indeed, its only legitimate child.

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For example, Seymours referendum bill to allow assisted dying (euthanasia) was officially named the End of Life Choice Bill, asserting its ideological origins with the word choice. He is proposing much more radical cuts to public spending and taxation than his only possible coalition partner, National.

We gained an insight into how ACT supporters think from the online reader-initiated Stuff/Massey opinion poll in July. Compared with the other parties in parliament, ACT supporters stand out as:

most likely to rate the New Zealand governments overall response to COVID-19 as unsuccessful: 29.5% compared with 9.9% for the whole sample

most strongly in favour of abolishing the Mori electoral roll: 68.2% compared with 36.6% overall

more likely to prefer that the government take a cautious and sceptical approach on climate change: 72.5% compared with 36.4% overall

more in favour of the country getting back to business as usual rather than reforming the economic system itself during the post-pandemic rebuild: 75% compared with 31% overall.

ACT supporters values are largely diametrically opposed to those upheld by Green supporters, as might be expected of a libertarian party that stands for individualism and deregulation.

In the past, though, the party has resorted to populist law-and-order and anti-welfare policies. In 2011 it deployed the one law for all slogan to attack policies addressing indigenous rights.

As ACT leader since 2014, Seymour has steered the party back towards free-market liberalism. But there is still an element of right-wing populist thinking among ACTs supporters.

Sizeable minorities of them agree with conspiracy theories about COVID-19 (25%) and hope Donald Trump is re-elected in November (32%) more than among National supporters who stood at about 20% on both points.

Read more: NZ election 2020: survey shows voters are divided on climate policy and urgency of action

If current polling holds true, Seymour will bring with him into parliament a caucus of freedom-loving individuals, none of whom has any previous representative experience.

Among them is a firearms enthusiast, a former police officer and a farmer. At number seven on the list is a self-employed mother of four who the party claims is better than ten ivory tower experts when it comes to beating poverty.

So far, ACTs best election result was in 2002 when it gained 7.14% of the party vote and nine seats in the 120-seat House of Representatives. If it repeats that in 2020, Seymour will go from being a lone voice for his party to the leader of a small but inexperienced caucus.

Managing that team of individualistic newbies may well be the first test of his libertarian instincts.

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The rise of ACT in 2020 highlights tensions between the party's libertarian and populist traditions - The Conversation AU