General election 2015: The worst gaffes and controversies 13 April: Smarter than a 10-year-old?

Former PR man David Cameron is used to spinning his way out of trouble against the most challenging interviewers - yet came completely unstuck on a visit to a primary school for Newsround. With his guard down, 10-year-old Reema asked: 'If you could pick one politician apart from yourself to win who would it be and why?' Cameron said it was the 'best' question he'd had so far on the campaign, um-ed, ah-ed and failed to give a clear answer.

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