I would not rule out Romney carrying PA in 2016 if he has a successful term, but now ? I rather doubt it. Bush fell short both times and Obama is still likely to get sufficient turnout from Philadelphia no matter how he fares elsewhere.
I think WI will be hard but that is the one I want to see Romney win. CO (and probably IA) should go for Romney if he wins.
I expect Romney to do much better in the Philly suburbs than McCain did in ‘08 or Bush did in ‘04. He will also do a little better in Philly itself. The rural normally Republican counties will see higher turnout. Romney will win the election because of higher turnout with better margins in coal producing counties. Obama wants those people out of the coal business. Bush lost by about 144,000 votes (51-49)in ‘04. Demographics have not helped Romney since ‘04, but I still expect him to win because Pa and the country are in trouble, and Romney is projecting confidence and hope. I may be wrong but have a deep hunch I am dead on. We will see.