Like BooMan, I've never quite figured out why Corbett is so unpopular. I get the reason he's unpopular - fracking/education funding are primary issues - just not why he's that unpopular. PA is a bit more blue than most of the states it usually gets lumped in with - it really isn't a swing state in presidential elections - and I get the sense that even self-identified Republicans aren't quite as tribal as they are in some other places - but it's still pretty bizarre.
The flip side is people here love to vote split tickets - makes them independent minded dontcha know - so I doubt it means much for Congressional races either way.