Why is Steve Coogan ditching Labour for the Lib Dems?

With many voters frustrated that in the UK's electoral system there are many constituencies where their vote may not make any difference, tactical voting has become a big factor in this election.

Opponents of the Conservatives have cited it as possibly the only way to defeat them.

One of the most high profile examples is the actor Steve Coogan - a long-time Labour supporter who has been campaigning for the liberal Democrats in his own constituency.

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