Campaign group the Electoral Reform Society says "AV represents a logical progression from first past the post. Preserving the traditional one member, one constituency, it ensures all MPs have a real mandate while delivering greater choice and eliminating the need for tactical voting.
The Alternative Vote (AV) is very much like First-Past-the-Post (FPTP). Like FPTP, it is used to elect representatives for single-member constituencies, except that rather than simply marking one solitary 'X' on the ballot paper, the voter has the chance to rank the candidates on offer.
The voter thus puts a '1' by their first-preference candidate, and can continue, if they wish, to put a '2' by their second-preference, and so on, until they don't care anymore or they run out of names.
If a candidate receives a majority of first-preference votes (more people put them as number one than all the rest combined), then they are elected.
If no candidate gains a majority on first preferences, then the second-preference votes of the candidate who finished last on the first count are redistributed. This process is repeated until someone gets over 50 per cent.
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Fairer Votes Q&A Meeting 01/12/10 Shrewsbury 6th Form College
Nick Clegg's statement on political and constitutional reform
Electoral Reform Society AV FAQ
BBC Q&A: Electoral reform and proportional representation
LibDemVoice Opinion: Why Lib Dems should have no reservations about campaigning for AV
Labour use AV in leadership elections
Compare 2010 general election under AV or PR
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