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The parties are hitting the campaign trail on the final weekend before polling day as polls suggest the election is still too close to call.Lib Dem Nick Clegg told The Guardian his party had taken Labour's place and it was now a two-horse race.
Gordon Brown told The Telegraph he had paid a "heavy price" for his bigot comments but was determined to see the fight through to the end.
It comes as two broadsheet newspapers ditch their support for Labour.
The Times threw its weight behind the Conservatives, saying leader David Cameron was ready to govern, while the Guardian backed the Liberal Democrats, saying it supported their stance on electoral reform.
In his Guardian interview, Mr Clegg said he was "going for broke" to get the most votes, claiming the election was now a two-horse race between the Conservatives and the Lib Dems. He said he aimed to gain 100 MPs in addition to the 63 his party had.
'Strategic error'
He said: "What is striking is despite all the blather from Cameron over the past few weeks, he has made up his mind strategically to set his face against any profound reform of the political system.
"I think this will prove to be the biggest strategic error he has ever made, because one thing you cannot do is set your face against change when the demand for that change is so powerful that it is coming from millions of people."
In an accompanying editorial, the Guardian "enthusiastically" backed the Liberal Democrats on the basis of the party's push for electoral reform.
Meanwhile, the Times came out in support of the Conservatives for the first time since 1992.
On Friday, Mr Cameron rejected an apparent suggestion that victory in the general election will be short-lived.
He was responding to a reported comment from the governor of the Bank of England, Mervyn King, that suggested the winners of the 6 May election will be kicked out of office because cut-backs will be so severe.
"I don't see why taking difficult political decisions and leading people people through to the good times ahead... has to be unpopular in the long-term even if it might be unpopular in the short-term," he said on Friday.
The Conservatives will focus on health on Saturday, a day after launching a "contract" - 16 pledges it vows to keep if elected to govern.
Polls steady
With the final televised debate complete, and two days after Mr Brown's "bigot" comment threatened to derail Labour's campaign, a YouGov poll suggests that the net effect appears to be an increase of 1% in their support, putting them joint second with the Lib Dems.
The poll also suggests that headlines declaring Mr Cameron the winner of the last debate have had no affect on his party's standing, says the BBC's poll expert David Cowling.
The YouGov poll suggested Conservatives were on 34%, which was no change on their last poll sampled before the debate; Labour up 1 point to 28% and no change for the Liberal Democrats also on 28%.
Mr Brown sought to clarify his "bigot" comment about a voter on Greater Manchester which was caught off-camera on a live microphone.
In an interview with the BBC's Jeremy Paxman, he said he thought pensioner Gillian Duffy had been talking about "expelling" all foreign university students.
Mrs Duffy had asked him about immigration and also mentioned student tuition fees, among other subjects.
He told the Telegraph he had "paid a very high price" for the incident.
It reported that a Sunday newspaper was set to reveal Mrs Duffy's "side of the story". Mr Brown apologised to her in a private 40-minute visit to her house after the incident.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.