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Labour has sunk below National in the latest 1News/Colmar Brunton poll, 43% to 44%.
It is the first poll since Simon Bridges took over the National Party leadership in February.
But Labour's partners in Government, New Zealand First and the Green, are both on or above five% and the three parties combined would translate to 66 seats in the House, comfortably ahead of National and Act with 55 seats.
Labour has sunk by five points, but its last poll at 48% seemed was unusually high.
Support for Prime Minister Jacinda Ardern as preferred Prime Minister is down by four points to 37% but she is well ahead of the 10% for Bridges, who replaced former Prime Minister Bill English in February.
Deputy Prime Minister and New Zealand First leader Winston Peters is on 5%, up 1 point.
The party vote results:
Labour 43% – down 5
National 44% – up 1
Greens 6% – up 1
New Zealand First 5% - up 2
Maori Party 1% – no change.