DougR:

I don't recall the GOP dumping a sitting senator because he/she only supported the Party's point of view 90% of the time.

You ignore the fact that Specter almost got dumped by a more "palatable" candidate to the foaming RWers that make up the core of today's Republican party. JoeMentum could probably have sneaked by if he hadn't been so stoopid that he insisted on mounting a petition drive to run as an independent in case he lost the primary, and refused to agree to accede to the party decision, as Lamont did. JoeMentum just acted arrogant and showed disdain for the party constituency whose nomination he was seeking. Shouldn't be any surprise they decided to dump him.

Cheers,