Libs ought to shun this guy for the Benedict Arnold he is
In that case, what do you have to say about Strom Thurmond, Ben Nighthorse Campbell, and Richard Shelby?
I don't think anyone should take the prospect of a monolitholic Democratic party too seriously yet though. As Will Rogers said, "I don't belong to an organized political party... I'm a Democrat."
Herding Dems is typically a lot tougher than Repubs when it comes to discipline.