Vernon Bogdanor, a professor of government at Oxford University, reckons that Mr Bercow is vulnerable.

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Vernon Bogdanor, of Oxford University, argues that the decline of party allegiance has also increased the appeal of a non-partisan head of state.

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If treaties are to be changed, though, Vernon Bogdanor, a professor at King's College, London, would push the elections yet further, and elect the entire commission on a Europe-wide basis.

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