This thread is silly. Obama campaigning for Wolf will change very few if any minds. People that rabidly anti-Obama were already voting for Corbett. On the other hand, he might be able to attract some African Americans that usually don't vote in midterms to come out. Yeah, Obama isn't exactly the most popular guy in this state (or most states), but you guys act like he has a John Edwards or Ron Blagojevich approval rating or something. Obama's approval is much better than Corbett's anyway (according to Morning Call, 39-50 vs. 29-55).
That said, you are right that this really isn't necessary. Maybe Wolf is just such a nice guy he wants to give Obama a win under his belt and not spurn him like every other Dem in a red or purple state.