the congestion charge wasn't feeble - it was a solution (a capitalist one!) to the problem of having more cars than road space. So the space was rationed by requring payment for it. Given Ken's emphasis on providing cheap public transport to complement the roads, this seems a decent traffic strategy.
(Mayors don't actually have many powers, but traffic is one of them.)
My objection to both Ken and Boris is their mania for skyscrapers.
There are at least six candidates
http://en.wikipedia.o...ayoral_election,_2012
but I think there may be independents as well.