Cameron Challenged by Johnson as London Mayor Backs ‘Brexit’

  • Possible Cameron successor among most popular U.K. politicians
  • Pound falls, `Brexit' odds cut after Johnson announcement

Measuring Brexit Influence of London Mayor Boris Johnson

London Mayor Boris Johnson, one of the U.K.’s most popular politicians and prominent Conservatives, said he’ll campaign for Britain to leave the European Union in June’s referendum, putting himself in direct opposition to his party leader, Prime Minister David Cameron. The pound fell the most in more than a month against the dollar.

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