Not that he hasn’t been one in everything but name anyway

Arlen Specter jumps ship.
Bon voyage! Don’t let the plank hit you in the ass on the way down.
If it didn’t hand Obama a filibuster-proof Senate, I’d be cheering louder. Instead, I’ll just make a contribution to Pat Toomey.
Arlen Specter, former RINO, now wins the Jim Jeffords Flip-Flop Award for the 111th Congress.
(Heh. That ought to piss off my Democrat in-laws, who live in the Commonwealth.)