Cameron's referendum pledge could be defining moment

For the first time in a generation, the possibility of Britain leaving the EU is on the mainstream political agenda.

This report is by political editor Tom Bradby:

Read: Tom's analysis of why the EU referendum pledge was "a huge moment in British politics"

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Clegg criticises EU referendum

David Cameron's EU referendum promise is "not in the national interest" and risks derailing the fragile UK economy, Deputy Prime Minister Nick Clegg warned.