The best result would be if the voters in Tony Blair's constituency voted him out; likewise, if the voters in Michael Howard's constituency dumped him.

And enough marginal seats would go Liberal to ensure that the next government, led by Gordon Brown, has to introduce a more representative voting system, which would mean that in future we could vote for the people we like best, without the risk of letting the Tories sneak back in again, ever.
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One paradoxical thing about this election is that, while normally parties want voters to think they are going to win, this time Labour's strongest card to play is the idea that the Tories might get in - and the Tories need to get people thinking there is no chance of a Tory victory, so we feel safe to give Labour a scare.