David Cameron has reacted to the Liberal Democrat surge in the opinion polls by warning a vote for Nick Clegg could see the country being "stuck" with Labour.

Opinion polls suggest the Lib Dems have enjoyed a sharp rise in support following the first TV debate.

Jim Naughtie speaks to voters in Durham, a traditional Labour strong-hold but where the Lib Dems are seeing a rise in public support, and political correspondent Norman Smith outlines how Tory MPs are reacting to Clegg's growing popularity.

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