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Gordon Brown, David Cameron and Nick Clegg are to criss-cross the country on Tuesday as electioneering intensifies on the campaign's penultimate day.The three party leaders have vowed to make every minute count as they battle to win over undecided voters.
Mr Brown will press Labour's case for fairness in the Midlands while the Tory leader plans to visit Northern Ireland and outline a "contract" for business.
Mr Clegg will argue that the Lib Dems can make gains in Labour heartlands.
All three are expected to hold rallies on Tuesday evening as the latest opinion polls suggest the Conservatives remain in the lead but short of what is required to secure an outright victory.
With two full days of campaigning left, the Tories received a boost on Monday when they were endorsed by the Financial Times for the first time since 1987.
Tactical advice
Meanwhile, two Cabinet ministers have sent the clearest signal yet to party supporters that they should vote Lib Dem in seats Labour cannot win to prevent the Conservatives triumphing.
Welsh Secretary Peter Hain said Labour supporters in key marginals should "vote with their heads not their hearts" while Schools Secretary Ed Balls said he wanted to "keep the Tories out" in seats, like North Norfolk, which are a straight fight between the Conservatives and Lib Dems.
The BBC's Political Editor Nick Robinson said this was "code" for tactical voting, reflecting Labour's trailing position in the polls and what ministers think is possible as they strive to avoid defeat.
The three party leaders are now set to campaign almost non-stop until polling day on 6 May.
Mr Cameron has pledged a through-the-night campaign from Tuesday night to Wednesday night, meeting people who work in the early hours like fishermen, bakers and florists. It is thought Mr Brown will follow suit with an overnight pitch for votes.
Speaking on Monday evening, Mr Cameron insisted he had momentum but there was "no ounce of complacency" in the Tory campaign and his party "still had everything to do" to win the election.
Visiting Northern Ireland on Tuesday, the Tory leader will again argue only the Conservatives can deliver the change the country needs.
Mr Cameron - whose party has an electoral alliance with the Ulster Unionists - will pledge to boost investment in Northern Ireland and not "single it out" for future cuts in public spending.
"I know that for many years people in Northern Ireland felt cut off from the rest of the United Kingdom," he will say. "I want to end that isolation."
'Fairness fight'
The Conservatives will also expand on their plans to boost economic growth, setting out a "contract" with voters to reduce business taxes, provide more apprenticeships and training places, reform the banking sector, and create jobs in sustainable industries.
Mr Brown has vowed to "fight every inch of the way and every second of the day" to secure a Labour victory, emphasising that only his party can secure the economic recovery while protecting schools, NHS and police funding.
On a series of campaign visits in England and Wales, the prime minister is expected to emphasise his commitment to fairness in difficult and uncertain economic times. Labour have stressed millions of voters have yet to make up their minds.
Meanwhile, the Lib Dems will continue to target traditional Labour constituencies in the north-west of England and Scotland, arguing that Labour have "betrayed" people and they are the only "progressive" alternative.
In an interview with the Times, Mr Clegg has said he will not insist on any pre-conditions - including on voting reform - in negotiations with other parties should there be no outright victor after the election.
The latest polls published on Monday suggest the Conservatives remain in front but are not extending their lead.
A Comres poll for ITV News and The Independent, conducted on 1 and 2 May, puts the Conservatives on 37%, down 1% on its last poll on 28 April.
The survey puts Labour up one point on 29% and the Liberal Democrats down one at 26%.
An Opinium poll for The Express, conducted between 30 April and 3 May, puts the Conservatives on 33%, down one point on the previous week, Labour up three points on 28% and the Lib Dems down one point on 27%.
The Sun/YouGov daily tracker puts the Conservatives up one on 35%, Labour unchanged on 28% and the Lib Dems down one on 28%.
The BBC's polling expert David Cowling said the surveys gave no sign of any significant shift in support for any of the parties.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.