Filner

No way.  The leader of a big city who is using his position to behave in a way that is universally understood to be reprehensible.  At least with Clinton, no one accused him of coercion to get sex.  It's bad enough when someone who is clearly bestowed a position of great power and trust acts in a juvenile manner, with lewd comments or sexual innuendo.  If you can't use the Mayor as a role model, who then?  But to use the position of authority for personal gain of any kind (including financial or sexual favors) needs to be intolerable.  Corruption is a blight capable of bringing down a government.  Everywhere possible, it needs to be met with unequivocal resolve: Not in my (community, city, state, country)!  No second chance for Filner.  He blew his big chance to be trusted.  It wasn't just a single or isolated incident. It's who he is.