The political divisions and allegiances triggered by the furore over secret donations to New Zealand First and leader Winston Peters have had little effect on party standings in the latest Herald DigiPoll survey.
Support for National, which has said it will not work with New Zealand First, has risen slightly, by 1.4 percentage points, to 51.4% of decided voters.
This would give it 68 seats in Parliament, enough for it to govern without a coalition partner.
Labour, which aligned itself with Mr Peters, is down 0.6 points to 35.7%.
The Greens have 4.9% and New Zealand First 2.8%.
