Santorum is a nobody.
As far as winning Pennsylvania, that is the state that kicked him out of his Senate seat by a HUMILIATING 17.4% defeat, and in the 2012 primary, “”Rick Santorum suspended his campaign in April after polls showed a strong possibility that he would lose his home state of Pennsylvania to Mitt Romney””.
Santorum turned his back on Pennsylvanian Republicans, and they returned the favor. Toomey has his problems, but when Santorum favored Spectre, (sic), over Toomey his fate was sealed.
You beat me to it. About the only thing he's good for is splintering the conservative primary vote, allowing a RINO to take the nomination. That is probably not Santorum's goal, but that's his effect.