National has hit its lowest level of popularity for seven years, the latest ONE News Colmar Brunton poll has revealed.
The gap between National and Labour has closed to just 7 percentage points, and on the basis of these figures, the opposition could form a Government in coalition with the Greens.
National's support is down six points to 43%, its lowest level in the ONE News poll since mid 2006.
Labour meanwhile is up three points to 36%, while the Greens have also climbed to 13%.
New Zealand First slipped back one point to three, while the Conservative Party gained 1%.
United Future moved up slightly to 1%, while the Maori Party is steady also on one.
If these numbers were converted to seats in Parliament it would mean a change of Government.
Labour would have 46 seats and with the Green's 16 it would give the centre left block a majority of 62 seats. The coalition could even have extra breathing room should they also take on the Mana party's one seat.
In this scenario National would have 55 seats, but even with the support of the Maori Party, United Future and Act, they would only manage 60 seats, assuming all current electorate seats are held.
In the preferred Prime Minister stakes John Key has slipped back five points, to 39, wiping all the gains he made in the previous poll.
Labour's David Shearer has not benefited though, remaining unchanged on 15%, however there are more New Zealanders now unsure about who they want in charge, making up 26% of those polled.
The ONE News Colmar Brunton Poll sampled 1000 eligible voters and has a margin of error of 3.1%.