The PA voters BHO loses are rural blue-collar Democrats—sportsmen and labor-types. He doesn’t lose all or even most of them, but he loses enough of them.
It’s a combination of race, guns and abortion.
The ones I talked to sort of fit that category. They are recently retired. One was a self-employed contractor. The other worked in corporate. Middle class. They lean democrat but vote both ways. The one lady I spoke to voted LBJ-Nixon-Carter-Reagan-Reagan-Bush-Clinton-Clinton-Gore-Kerry. But she ain't voting for Obama and it ain't because of race. It's because he doesn't have the resume to be president, and because his wife is a piece of work. And because McCain has proven himself to be different from the usual republicans, who have really not done much to sell themselves to voters like this.