The UK's relationship with Europe will be a key issue for the coalition as Cameron prepares to make his long-awaited speech on the subject.
Nigel Farage, leader of UKIP, told Today presenter John Humphrys that the party will be able to make the transition from being a single issue party to a mainstream political player.
"I'm odd in the sense that I'm a conviction politician
I'm here as a campaigner," he said. "We are a voice for good, ordinary people in this country."
"I want to free this country from the European Union," he added.
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