TONY Abbott risks becoming a one-term prime minister unless he lifts the Federal Government’s fortunes, with Labor opening up a 10-point 55-45 lead on a two-party-preferred basis.

After a week of confusion over the fate of the $7 GP fee and Mr Abbott’s confession that the Government had a “ragged” week, support for the Coalition has plunged again.

For the first time, Labor under Bill Shorten has also overtaken the Coalition on the primary vote since the election of the Government.

Support for the Labor Party has hit 41 per cent on primaries.

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An exclusive Galaxy poll commissioned by the Sunday Herald Sun reveals that primary support for the Government has plunged to 38 per cent.

That represents a 7.5 per cent drop since the 2013 election when the Coalition secured 45.5 of the primary vote.

Labor’s primary support of 41 per cent compares to just 33.4 per cent under Kevin Rudd’s leadership at the last election.

“Support for Labor has increased in the latest poll to 41 per cent,” Galaxy pollster David Briggs said.

“This is the first time Labor has been ahead on primary support in any Galaxy poll since the Abbott Government was elected.

“In Victoria, support for the Coalition is below the vote achieved by the Napthine government at the state election last weekend.

“Given that the Coalition lost government in Victoria after just one term in office this suggests that a similar fate could await the Abbott Government unless voters see a notable improvement in their performance.”

The findings suggest the Coalition has squandered an improvement in polls when Mr Abbott’s numbers started to lift as he was praised for his handling of the MH17 crisis.

The result will strengthen the arm of Government ministers who are insisting Mr Abbott change how he and his office operate. Mr Abbott is expected to announce a modest reshuffle of his front bench after his summer break.

The Coalition’s primary support has plunged four points since the last Galaxy poll in early October, with the primary vote dropping from 42 per cent to 38 per cent.

“Support for the Greens continues to be above the vote achieved at the last federal election and now stands at 11 per cent,” Mr Briggs said.

“Support for the Palmer United Party remains at 4 per cent and other minor parties and Independents remain on 6 per cent support.

The poll was based on a national sample of 1406 voters and was conducted over December 2 to 4.