Fillon is no more corrupt than the other guys. If anything, he used a look a little cleaner than the others, certainly a hell of a lot cleaner than sarkozy for example. Fillon stepping down would have been meaningless, no one credible wanted to step in.You have to imagine LR's going to do a much more thorough vetting next time. Or, you know, actually try to get their guy to step down when he said he would.