Labour shoots up in first full poll since Cunliffe took over
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The first full poll since David Cunliffe became Labour leader has his party up 6.8 points to 37.7%.
The same Herald-Digipoll survey has National down 5.1 points since June to 43.7%.
Based on the poll, Labour could form a government with the support of the Greens, and Mana (if it holds its single Maori seat).
New Zealand First came in just under the MMP threshold at 4.4% - a roboust result for the party that usually only peaks around election time.
The poll has John Key's support as preferred Prime Minister down 9.4 points to 55.8% - his lowest rating since taking office.
Mr Cunliffe, who has not previously appereared in the Herald-Digipoll's preferred PM category, debuted at 16.8% - trailing Mr Key by a wide margin but ahead of David Shearer's June preferred PM rating of 12.4%.
Labour named its new leader on September 15. The poll of 750 eligible voters was taken between September 17 and 23 and has a margin of error of plus or minus 3.6 per cent. The party vote result is of decided voters; 8.6 per cent of respondents were undecided.
The Herald is billing it as the first full poll since Mr Cunliffe took control of the party.
It contrasts with a OneNews-Colmar Brunton poll released Sunday that had Labour and National both up 1%, with National able to form a government with ACT and United Future support.
The OneNews-Colmar Brunton poll surveyed 1000 eligible voters between September 14 and 18.