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The government backbench is voicing concern about policy in the lead up to the budget. Analysis with Chris Hammer and Mark Kenny.

Senior Liberals have described plans for a possible deficit tax in the budget as "electoral suicide".Some talked of a party-room revolt and one warned the Prime Minister Tony Abbott would wear the broken promise as "a crown of thorns" if the government decided to go through with it.

The figure, part ofMr Abbott's ministerial team, spoke on condition of anonymity, arguing the suggestion of a tax was one that could come to "haunt"Mr Abbott's entire prime ministership.

Tough sell: Prime Minister Tony Abbott speaking to Neil Mitchell on Fairfax radio in Melbourne. Photo: Penny Stephens

"I worry that this is Tony's Gillard moment, when she announced the carbon tax," said the senior Liberal.

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Several other Liberals also expressed dismay at the prospect of a government, elected to restore trust to politics, overturning a "crystal-clear" policy commitment of no new taxes, in its first budget.

Incredulous Liberals contacted by Fairfax Media said they had been given nothing to tell voters who were beginning to call electorate offices to complain.

A Gillard moment: Senior Liberals are worried that Tony Abbott's deficit tax could spell disaster for the government. Photo: Alex Ellinghausen

Continued here:
'This is Tony's Gillard moment'