Opposition Leader Tony Abbott is almost certain to face a hung Parliament of his own as he cruises to victory in this Saturday's election, with an unpredictable mixture of minor parties set to control the new Senate.

An extraordinary proliferation of microparties arranging tight preference deals with each other could see the Coalition lose seats in the Senate even as it wins a big majority in the House of Representatives.

The Fairfax Media analysis comes as reports emerge of Prime Minister Kevin Rudd's behind-the-scenes fury at how events have soured for him. According to several sources, his travelling party has witnessed familiar outbursts of anger and a growing cranky demeanour from the PM, while campaign headquarters in Melbourne is at a low ebb. Staff members who have dared to voice opinions and challenge strategies have been removed, leaving a sense of distrust and insecurity among those remaining.

Frustration is also growing at how Mr Rudd and his pseudo campaign manager, Bruce Hawker, have been freewheeling on strategies and policy. "The mood is so depressed. It's like there is no reason left to keep fighting," one insider said.

Opposition Leader Tony Abbott, meanwhile, has sparked debate while campaigning in Queensland, saying he found the burqa ''very confronting attire''.