Look at what happened with his 2012 election
Hills have cut their odds for Boris Johnson to be the next Prime Minister from 8/1 to 6/1 second favourite behind 4/5 favourite Ed Miliband. This seems weird because just about the only chance there is of a vacancy occurring is if Cameron wins the election when he’ll remain at Number 10.
The mayor’s big opportunity will most likely come if Dave loses or he decides to step down in a few years time. In the case of the former Mr. Miliband would become PM.
There’s another factor that might worry Team Boris – how the polls over-rated his chances, in come cases by big margins, in the last mayoral election.
At the moment this doesn’t matter but you can bet that his opponents will circulate data like in the chart above if there is a leadership contest and Boris runs for the job.