Sorry, Governor Ryan of Illinois beats out McCain by a mile. At least McCain PRETENDS to a Republican. When McCain was casting a token vote to remove Clinton, Governor Ryan was out defending Bubba. When McCain was voting to pan partial-birth abortion, Ryan was vetoing a bill that would have ended funding for it. When McCain was sending out mail denying he had a rift with George Bush, Ryan was gloating that he hoped the "hard right" of "his" party would LOSE.
Hell, Ryan's so far to left, he probably thinks Dasshole is conservative.