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Alternative Vote (AV) referendum divides Clegg and Cameron

There are 10 weeks to go before the UK-wide referendum on the Alternative Vote (AV) system, where David Cameron likes the way we do things now, but Nick Clegg and Ed Miliband do not.

David Thompson reports explains how votes stack up under the AV system and why the yes and no campaigns may not be pushing the main party leaders in their campaigns.

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