Santorum is perhaps the most conservative Republican in the Senate.
Santorum is dead meat. He made himself look too foolish too often, in a state where he is to the right of the state. One little example was when he said the national weather service should be shut down, and weather tracking should be left to private industry. Yes I know, Santorum has a better shot at election to the Senate than Kathleen Harris does. Keep hope alive.
I'd say Dr. Coburn is the most Conservative, but I agree that not only PA Conservatives, but PA Republicans (not necessarily the same thing) not voting for Santorum are fools.