Casey would do well to move to the left on social issues. You have to remember he is carrying a name, nothing more. With this leftward movement he will have access to oodles of cash, not have to worry about the peripheral Southeastern PA counties, and hold chunks of central and Northeastern PA intact with the name rec alone. Now he doesn't have to be Pennacchio, but a leftward movement would benefit him.
If his drift to the left is so obvious, Santorum can hit him on it and those Casey Dems might stick with Rick.