Tactical voting: it's not (quite) dead yet

Reassuring news for Labour: Billy Bragg, despite his opposition to the Iraq war, has rallied to the tactical voting cause and is again urging Lib Dem sympathisers in Dorset South to vote Labour. In return, he says, he'll find Labour voters in the Lib Dem marginal of Mid-Dorset and Poole who are prepared to switch allegiance. He calls it finding your voting Valentine. At the time of writing, no Dorset voters were visibly seducing each other. Could it be that the Iraq war has ruptured the centre-left consensus and killed off tactical voting? Still, at least VoteDorset represents an alternative to the UK-wide TacticalVoter.net, which is sometimes plagued by broken links and decidedly tenuous reasoning - should Lib Dem voters really vote Labour in the hope that the resulting Tory slump propels the Lib Dems into second place nationally? Discuss, as TacticalVoter doesn't say.