The party leaders began a frantic final round of campaigning yesterday, as they insisted anything could happen in Thursday's General Election.
Conservative leader Michael Howard and Labour leader Tony Blair both insisted the Conservatives could win, despite a series of polls showing Labour firmly in the lead.
And Charles Kennedy, the Liberal Democrat leader, kept up the pressure on Tony Blair over the Iraq war.
Mr Blair tried to motivate Labour's core supporters with a warning that voters who stayed at home or voted Liberal Democrat, in order to punish the Government, could help the Tories win the election,
Alongside Gordon Brown, the Chancellor, he unveiled a poster in Wimbledon, London, saying: "If one in ten Labour voters don't vote, the Tories win."
Mr Blair said: "There's a real risk if people drift off, staying at home or voting Liberal Democrat, they can end up with a Conservative MP even though they don't truly want one."
Mr Blair's communications supremo, Alastair Campbell, said the Conservatives needed to target voters in just 165 key marginal constituencies to overturn Labour's majority.
Swing voters in the most important seats had been identified by a computer system called Voter Vault, and were being bombarded with Tory leaflets, Mr Campbell claimed.
Mr Howard told activists in Manchester he was "very confident" of an election win - and accused Mr Blair of running a negative campaign:
He said: "Our message is all about the future - more police, cleaner hospitals, school discipline, lower taxes and controlled immigration."
He added: "After eight years in power, Mr Blair's one message about the future is 'Don't let the Tories in'. That's it. That's the limit of his vision."
He set out the priorities for a Conservative government, including cutting police paperwork, putting matrons in charge of hospital cleaning, securing borders, and giving headteachers the power to expel unruly pupils.
Up to five million pensioners would get council tax discounts of up to £500, stamp duty would be cut, and tuition fees scrapped, he said.
The Liberal Democrats received a boost as former BBC director general Greg Dyke warned that another government led by Tony Blair would undermine British democracy.
Mr Dyke, a Labour supporter for 40 years, pledged his allegiance this time to the Liberal Democrats and accused Mr Blair of running a "presidential" government.
He said: "I do genuinely believe that our democracy has been undermined in the years since the Blair Government and I think another Blair Government would pose further dangers to our democracy."
Mr Kennedy sought to keep the issue of trust at the forefront of his campaign, as he launched a two-pronged attack on Labour and the Conservatives.
He said: "History will certainly judge Tony Blair on Iraq - but first the British people will judge him. And they will judge the Conservatives too. Tony Blair's judgment on the Iraq war was fatally flawed, but the Conservatives have been utterly incoherent, utterly opportunist and utterly flaky."