David Blunkett
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David Blunkett oppose change to AV election system

Senior Labour and Conservative politicians are teaming up to campaign against a change to the current voting system in general elections.

A referendum is being held in May next year on whether to move from the first-past-the-post method to a form of proportional representation called the alternative vote.

The Conservatives and Lib Dems agreed to hold a referendum as part of their coalition deal but Prime Minister David Cameron and his deputy Nick Clegg are on different sides of the argument over the need for change.