The Herald carries the details of the Greens attempt to form a more formal coalition with Labour:
Labour yesterday rebuffed a proposal by the Green Party to present both parties as a coalition Government in waiting during in the run-up to the September 20 election.
Labour leader David Cunliffe indicated that such a pre-election arrangement could have posed problems with post-election negotiations with other parties, such as New Zealand First.
Which might not seem like a big deal. But if you look at what’s happening in the polls over the last few months you see a pretty consistent pattern. Labour are losing votes to National and New Zealand First. But they aren’t losing any votes to the Greens.
Now there could be a bunch of reasons for that but my guess is that most Labour voters who are sympathetic to the Greens – and according to the Colmar Brunton poll that’s about 70% of Labour voters – don’t feel the need to switch because ever since the NZPower launch there’s been a kind-of-consensus that a vote for Labour is a vote for a Labour-Greens coalition. Labour’s announcement that this isn’t the case and that a vote for Labour could also be a vote for a Labour-New Zealand First coalition seems like a big risk. I can see why they took it: they want to win back those votes from National and think its going to be tough to do when they’re in a formal alliance with the Green Party. But I’d also note that Labour’s high-point during this electoral cycle came after the NZPower Labour-Greens co-announcement back in 2013, suggesting that center voters are less repulsed by the idea of a coalition than Labour’s caucus are.