Forgot to mention. To even have A CHANCE at PA, the GOP will need to nominate Christie.
This and the post above are spot on. It is also demonstrative of the GOP's bigger problem. How do they win upper Midwest states while staying competitive in the new battlegrounds like Nevada, Colorado, Virginia, etc...?
To win Michigan for instance, they will have to drive up social conservative rhetoric to bring up their margins in the rural areas while hoping it doesn't impact them among moderates... I'm sure they assume they'll lose blacks no matter what but saying they are anti gay marriage shouldn't make the black vote any more democrat in their minds.
At the same time, how do they hold onto a state like Colorado which is getting really liberal when they take those kinds of positions.
The problem for Republicans is the map is shifting in the Democrat's favor so they have to win combinations of states that have really different electorates, whereas Democrats only have to win a few of these states.
Additionally, democrats have proven much better at coalition building.