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 don't buy that 18% margin. Casey, Jr. has done nada to obtain it and Santorum clearly chipped away at his deficit, and nothing has occurred for him to have suddenly plummetted. I doubt that he is any more than 6 points down.