If voters come out in the conservative “T” in PA (look at state and superimpose a T over it) and the Phila. and Pittsburgh suburbs (Arlen Specter’s former coalition) go about 50/50, Trump can win PA.
Last couple of elections, the conservative voters there have not been that enthused about the GOP candidates and Obama got 100%+ of the Phila. city vote, so it was no contest.
I wouldn’t count on PA. I think CO is easier pickings.
James Carville once described Pennsylvania as Philadelphia and Pittsburgh and Alabama in between.