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Labour's popularity has slumped following the credit card expenses scandal, a TV3 poll released tonight shows.

The poll, of 1000 people, saw National's popularity increase to 55.3 per cent while Labour fell to 30.5 per cent.

The Greens remained the strongest of the smaller parties with 7.5 per cent.

The Maori Party had 1.9 per cent, New Zealand First 1.8 per cent, ACT 1.6 per cent and United Future 0.1 per cent.

Labour also fell well behind in the preferred prime minister stakes.

Prime Minister John Key remained the favourite with 49.6 per cent.

Labour leader Phil Goff was on 5.1 per cent, while former Labour leader and prime minister Helen Clark was not far behind on 4.9 per cent. Winston Peters had 2.8 per cent support for the top job.

Mr Key was performing well according to 69 per cent of those surveyed, while 15.9 per cent said he was performing poorly.

Mr Goff's numbers showed 27.2 per cent thought he was performing well and 45.4 per cent performing poorly.

Mr Goff said it had been a "tough week for Labour" and the credit card scandal had been a "distraction".

Mr Key said it was a good result for the Government and reflected the "strong endorsement" of the Budget.