PA is a slightly democratic state and Casey appeals to moderate. Ridge is old news and was a member of the Bush admin. He would have lost.
Ridge might have been able to bring enough votes to Fitz to win...I say might since the margin is small, but on the other hand it seems Murphy ran a damn good campaign...but in a Democratic year like this, plus Ridge's time in the Bush admin, may not be the positive some think it could be.
Schweiker on the other hand, if he could remind people who he was might have been able to defeat casey.
But Casey pretty much had this one in his pocket.