Even if he is elected, he just kissed any Committee Chairmanships goodbye.
Two words: Arlen Specter.
Freshman don't typically get Chairmanships right off the bat. I don't think so anyways.
Besides such behavior doesn't seem to impede the prospects of McCain, Specter, Graham, Chafee, etc.
Heck I think you get rewarded for bad behavior, that's why there is so much of it.