A new poll shows Labour's support has leapt since David Cunliffe took the leadership reins, and it would have the numbers to form a coalition government.
A Herald-Digipoll released on Wednesday sees Labour jump 6.8 points since the last poll in June to 37.7 per cent support, while National is down 5.1 to 43.7 per cent support.
The Greens are up 0.8 points to 11.3 per cent and Mana is up 0.2 points to 0.7, while support for all other parties has fallen, including NZ First, which dropped 0.7 points to below the five per cent threshold, on 4.4 per cent.
Assuming minor parties keep their electorate seats, the poll translates into 56 seats for National and 48 for Labour.
With 14 Greens seats and one from Mana, Labour would have 63 seats in the 124-seat house.
Labour has also jumped in the preferred prime minister stakes.
While Mr Cunliffe is on 16.8 per cent - up from predecessor David Shearer's 12.4 per cent in June - he's still well behind Prime Minister John Key, although he's shed 9.4 points to 55.8 per cent.
Another encouraging sign is 20.4 per cent of voters saying they were more likely to vote Labour next election with Mr Cunliffe in charge, while 14.4 per cent were less likely and the rest said it would make no difference.
The poll, of 750 voters, has a margin of error of 3.6 per cent and was taken from September 17-23 - just after Mr Cunliffe was announced leader on September 15.
However, it's at odds with a One News-Colmar Brunton poll at the weekend, which saw Labour rise just one point to 34 per cent, while National also rose one to 47.
The Greens slipped two points to 12 per cent, while NZ First was steady on four per cent.
Mr Cunliffe was on 12 per cent as preferred prime minister - even lower than Mr Shearer's July result of 13 per cent - while Mr Key rose one point to 42.
That poll was taken from September 14-18.