A left-wing website run by a former Birmingham student is urging anti-war voters to support the Conservatives in 19 West Midland seats.
The tactical voting plea is designed to stop Tony Blair winning another landslide victory at the next General Election.
The site is the brainchild of Keith Mothersson, who votes for the Green Party and studied politics at Birmingham University as a postgraduate.
But last night the scheme was branded "ludicrous" by Labour.
Mr Mothersson has compiled a list of key marginal seats across the country with advice on how voters can reduce the size of Mr Blair's majority in the House of Commons.
In the 1997 election he helped organise a similar campaign to encourage tactical voting - but then the aim was to defeat the Conservative Government led by John Major.
Although the Conservative Party supported the war in Iraq, the website urges voters to " hold New Labour to account for the illegal invasion of Iraq" by voting against Labour MPs it says failed to oppose the war.
It argues that Michael Howard's Conservative Party cannot win the General Election. However reducing Labour's majority in the Commons and defeating pro-war Labour candidates would give more power to anti-war MPs, it says. The message is a direct contradiction of Labour's argument that supporters who desert the party in protest over Iraq could help the Tories to win the election.
The site can be found at www.strategicvoter.org.uk.
Two Ministers, Mike O'Brien in Warwickshire North and Jacqui Smith in Redditch, would lose their seats if voters followed its advice.
Among its suggestions, the site urges voters to unseat Sylvia Heal, the Deputy Speaker and MP for Halesowen, who it says failed to oppose the war.
However it does not make clear that Mrs Heal's role means she does not vote in the Commons and could not have publicly expressed an opinion about the war.
A Labour spokeswoman said last night: "The only way to ensure that Britain does not end up with a Tory Government and £35 billions of cuts to public services is to vote for a Labour Government.
"It is ludicrous to suggest that you should vote Tory to get a Labour Government - albeit one with a reduced majority. The only way to get a Labour Government is to vote for one." n Labour has chosen council worker Paul Bell to fight Leominster, in Herefordshire.
The safe Conservative seat was briefly represented by a Labour MP when Peter Temple-Morris defected in 1998.
The constituency is represented by Bill Wiggin.