LONDON-- Mayor Boris Johnson, one of the most charismatic figures in U.K. politics, threw his considerable influence behind the push for a British exit from the E.U. on Sunday, the BBC reported, instantly galvanizing the campaign and potentially tipping the country toward a vote to leave in a June referendum.
A decision to defy Prime Minister David Cameron, a fellow Conservative, would represent a personal gamble and a coup for the “leave” camp, which has been riven by bickering factions and lacked a high-profile, broadly palatable leader.
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