From Politico's Arena, some great comments and interaction.
What do you do with a Senator who's been out campaigning against his own party? Do you continue to let him run Senate committees? Do you make him run smaller ones? Do you give him a time-out?
Personally, I have no idea what you do. But here's my favorite comment:
As a Republican, I think that the Democrats should strip him of his committee chairmanship, throw him out of the party, and make very, very clear that they don't want him to vote with the Democrats ever again.