You are not permitted to download, save or email this image. Visit image gallery to purchase the image.
But Labour and the Greens combined have almost the same amount of support which suggests it could be a nail-biting election year in 2020.
National is on 46%, down one point from the last poll in early October.
Act is up by one point to two% and, assuming David Seymour kept the Epsom seat, would have two MPs.
Labour is down one to 39% and the Greens are steady on 7%.
New Zealand First is unchanged on 4% and, without an electorate seat, would not be returned to Parliament.
Translated to an election result, the poll would see National and Act would get 61 seats, and Labour and the Greens 59 seats.
Prime Minister Jacinda Ardern is down two points in the preferred Prime Minister stakes to 36% but she is still well ahead of National leader Simon Bridges on 10%, up one.
National MP Judith Collins is on 4%, down one point, New Zealand First leader Winston Peters down one to 3% and Christopher Luxon, the former Air New Zealand chief and National candidate for Botany has registered on one%.
The poll was conducted between November 23 and 27. National released its hardline law and order policy on November 26.
Act's David Semour has increased his profile this year through opposition to gun law reform and through the passage of the End of Life Choice Act through Parliament.