They have opened a significant lead over Labour and its ally the Greens with a Fairfax Media survey this morning putting National on 49 percent support and Labour on 31 percent.
A New Zealand Herald poll showed the main parties closer together -- National on 47.9 percent and Labour on 36.4 percent -- but both surveys mean National would not need the Maori Party to hold a majority in Parliament.
Today's polls follow last night's TV One and TV3 surveys which also showed National and its allies with enough support to hold off Labour's challenge.
Key features in all four were a surge of support for the Greens and increased backing for the ACT Party.
The Greens, who are committed to supporting Labour, can expect to win nine or 10 seats if poll results turn into votes tomorrow. They had six MPs in the last Parliament.
ACT seems assured of at least three seats, which would bring put Sir Roger Douglas back in Parliament.
All the surveys spell doom for New Zealand First, which has not been able to reach the 5 percent threshold it must achieve to get any MPs in Parliament without holding an electorate seat.
Leader Winston Peters is standing in Tauranga but National's Simon Bridges is well ahead.
Labour leader Helen Clark and National's John Key will be out on the campaign trail today, campaigning up to tonight's deadline.
Miss Clark is staying in Auckland to shore up Labour's vote in the city while Mr Key will be back on his charter plane to swing through regional centres.
Last night Miss Clark was shrugging off the poor poll results for her party.
Labour insists its own polling shows the centre-right parties National and ACT neck and neck with the centre-left Labour/Greens combination.
But today's polls show the election has slipped away from Labour, even though it has managed to make up ground during the campaign.
The gap has been closing, but not fast enough to make the difference Labour needs to win a fourth term.
