On current polling, ACT will be out of Parliament unless former Auckland mayor John Banks wins Epsom.
ACT's New Plymouth chairman Morris Hey wants John Key to honour a deal he says it had with ACT and withdraw National candidate Paul Goldsmith from the Epsom race.
We wanted to know how big a threat Goldsmith is, so we surveyed 100 Epsom voters across the electorate.
We asked them which candidate they would vote for if an election was held tomorrow, and spoke to Mr Banks about the results.
Watch the video.