I think Sestak can win this fairly convincingly. Obama was never a great fit for Pennsylvania, Hillary very well could run ahead of Obama throughout western PA. Unlike coal country, it doesn't seem like Democratic support is going to totally collapse. Although it was a state and not federal race, Wolf met his statewide averages in counties like Cambria, Fayette, Greene which have trended GOP for years and Obama lost easily.
I'm inclined to agree. Minus the strong turnout and hence support for Obama in Phillie, he's been pretty unpopular all along.
Clinton will return some of the more Conservative Democrats to the Dem camp... at least for 2016.