Tony Blair and Michael Howard have made whistlestop visits to Midland seats as a new poll showed Labour under pressure in marginal constituencies.
Mr Blair was heckled by pro-hunting campaigner Otis Ferry, the son of rock star Bryan Ferry, as he visited The Wrekin in Shropshire.
And there were rowdy scenes as Conservative activists clashed with Labour supporters while the Tory leader make a speech in Tamworth, Staffordshire.
Both are marginal Labour seats which the Conservatives could win.
It followed a poll focusing on voting intentions in 108 marginal constituencies which suggests the Conservatives are doing better in key seats than national surveys suggest.
The Tories have targeted specific voters using the same sophisticated computer system that helped the Republicans win elections in the United States.
Voters across the country have received calls from telephone canvassers at the Conservative campaign centre in Coleshill, Warwickshire.
If the strategy is working, as the poll suggests, a number of West Midland seats held by Labour could be vulnerable.
They include Rugby and Kenilworth, Redditch, Shrewsbury and Atcham, Wolverhampton South West, The Wrekin, Stourbridge, Burton, Warwick and Leamington, Stafford, Tamworth and Edgbaston.
Mr Ferry shouted at Mr Blair to "stop smiling" as the Prime Minister arrived at a church hall in Wellington, Shropshire, in the Wrekin constituency.
He shouted: "Tony Blair, you should be ashamed of yourself. You are ruining our countryside.
"Tony Blair, go back to the city. That's the only place you are welcome."
Mr Ferry, aged 22, is master of the South Shropshire Hunt and is currently on bail awaiting trial on charges relating to the invasion of the House of Commons by hunting protesters.
He said he had been canvassing on behalf of the Conservatives during the election campaign.
The Prime Minister was accompanied by Gordon Brown, the Chancellor, during the visit.
The pair have been stressing their unity at constituencies across the country during this election.
Mr Blair unveiled a spoof Conservative Queen's Speech, which he said contained the measures Michael Howard would bring in if he was victorious in tomorrow's vote.
The speech promises that a government led by Prime Minister Howard would "take Britain back to the 1980s and early 1990s and the days of interest rates of 15 per cent, recession, mass unemployment, and cuts to schools, hostels and the police".
Mr Blair has argued that vulnerable seats such as The Wrekin could fall to the Conservatives if Labour voters switch to the Liberal Democrats as a protest vote.
The argument, which is strengthened by yesterday's opinion poll, is an attempt keep Labour voters loyal by appealing to their dislike of the Tories.
However, Mr Blair was attacked by Liberal Democrat leader Charles Kennedy.
Mr Kennedy said: "He has suddenly realised how attractive the Liberal Democrat message is. He has suddenly realised that it is Liberal Democrat policies to which voters are responding."
He added: "What I would say to people is go out and vote Liberal Democrat whatever the apparent supposed circumstances in your constituency, because every vote will give us, and give myself, more credibility in the next House of Commons and every vote has got a greater opportunity than ever before of electing a Liberal Democrat MP."