Prime Minister John Key has plunged in personal popularity dropping by 7.3 points and Labour leader David Cunliffe has jumped by 3.9 points, in the latest Herald DigiPoll survey.
New Zealand First leader Winston Peters has also risen.
Mr Key is still well above either of them as preferred Prime Minister on 61.6 per cent.
But it is his second lowest rating in a Herald DigiPoll survey since becoming Prime Minister in November 2008.
Mr Cunliffe has risen from 14 per cent to 17.9 per cent, the best personal rating he has had in DigiPoll since taking over the Labour leadership in September last year.