`Brexit' Odds Shorten as Johnson Joins Campaign to Leave: Chart

The One Question Brits Are Asking: In or Out?

‘Brexit’ campaigners are gaining momentum. Not only do they have the backing of one of the U.K.’s most well-known politicians, London Mayor Boris Johnson, but the chances of a vote to leave the European Union are increasing. With 122 days to go until the June 23 vote, the odds-implied probability of ‘Brexit’ is 34 percent, according to Paddy Power Betfair Plc’s betting exchange. At the same point in the run-up to the Scottish independence referendum, the chances of Scotland leaving the U.K. were more remote, at 26 percent.

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