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Votes referendum: Deputy PM Nick Clegg's speech in full

18 February 2011 Last updated at 14:18 GMT

The Deputy Prime Minister Nick Clegg has set out the case for changing the voting system for Westminster elections to the Alternative Vote.

Mr Clegg said the traditional first-past-the post-system ignored "millions of people".

In a separate speech, David Cameron argued that the existing system allowed voters to "turf out" unpopular governments.

They were setting out their arguments as campaigning began ahead of the 5 May referendum on voting reforms.

How the Alternative Vote system works