So do they got votes for clearly being cylists, lose them for not wearing helmets or what? Good role models?

I feel sorry for anyone who would use a politician as a role model (unless they were an apprentice self-serving liar).

whilst his pr campaign only shows him on his bike, does he take us all for fools?

I think you're reading a bit more into this than me. I just see David Cameron on his bike.

another tory cyclist is Sir George Young