They've criticised National over electorate deals - but 1 NEWS has confirmed Labour and the Greens are doing deals of their own for next year's election.
Greens co-leader Metiria Turei is planning to run in Te Tai Tonga, taking on Labour's Rino Tirakatene.
And in Nelson, Labour are talking about standing aside to give the Greens a clear run there.
In return, the Greens wouldn't contest the Ohariu seat long held by United Future's Peter Dunne.
Speaking to TVNZ's Breakfast programme this morning, Labour Leader Andrew Little refused to confirm that deals have officially been done, but said that provisions are in place for such deals between parties.
The Greens' Maori support is growing - they've got a Maori caucus now, and they want to acknowledge that by running in Te Tai Tonga. Ms Turei previously stood there in 2005.
The party was also bequeathed money by an anonymous donor, with the condition it was used in the Nelson and West Coast-Tasman electorates, so they feel they can fight a strong campaign there.
But 1 NEWS understands the deal hasn't gone down well with some in the Labour Party - Mr Tirakatene is "peeved" and feels like he was "horse traded" after he was told about the deal two weeks ago.