National and Labour are both down while NZ First has gained support in the latest opinion poll.
A new Roy Morgan poll shows National down 3.5 points to 42.5 percent and Labour down two points to 26 percent.
NZ First has jumped 3.5 points to 12.5 percent -- a 20 years high in the poll.
The Greens gained half a point to 14.5 percent and there was little change in the minor parties.
The poll results mean that if an election was held now, National would be just ahead of a Labour/Greens alliance and NZ First would hold the balance of power.
The poll questioned 843 voters earlier this month.