I've been reading about "Boris the Menace" for years so I know who he is and what an idiot he is.

Most of the voters have no idea or they wouldn't have voted for him either.

It is a classic tactic to field someone that nobody really knows anything about as a "fresh" candidate running against an old hand.

Of course these days with all the Apathy that exists most people don't know who's in government, I've heard people on the tube admitting they don't know who the prime minister is, let alone anything about the MP for Henley - now Mayor of London, so fielding an unknown was never going to be that hard.