UMR research Executive Director Stephen Mills told Newstalk ZB's Chris Lynch that volatile polls this election campaign reflect an increase in swing voters.
Tonight's 1News-Colmar Brunton poll again flips the lead, with Labour in front on 44 per cent, with enough support to govern backed by the Green party.
It's a completely different story from the Newshub-Reid research, which showed National on 47 per cent, surging ten points ahead of its main competitor.
After hearing completely different stories from two results this week, a pollster says voters need to read between the polls.
Mills said private party polls also tell a story.
"If you average the Newshub and the Colmar Brunton you get about exactly where National's private polling is."
He said there's a lot more up in the air this election.
" I think that it seems to be what is happening internationally, that people are being unleashed to kind of change their mind, and change their mind often."
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