I don't agree that it will take Hell freezing over. HockeyDude is right in pointing out that many Republicans in the Philly (and Pittsburgh) suburbs don't care if gays get married. That being said, look at the legislature. This isn't changing anytime soon (assuming we don't consider action in the courts). And I wouldn't point to Philly for votes in favor of gay marriage. Yes, an overwhelming majority would support it and views in historically hostile communities are "evolving" but we have our populist pockets that would still be against it. It wouldn't be an 85% to 15% result. It wouldn't be like Toomey vs. Sestak.
Speaking of that race, I don't think that's proof that PA is less conservative than Grumps thinks. Sestak did well for other reasons.
Not saying you are wrong, but elaborate. That was a GOP wave year, Toomey was doing just fine in the polls and it went down to the wire anyway. I'm starting to think that pollsters don't quite "get" PA's electorate anymore.
I make my prediction about SSM being so close in a hypothetical PA vote due to those very same populist pockets you speak of (voting Dem/anti-SSM) being somewhat offset by fiscal conservatives in the 'burbs (voting GOP/pro-SSM).
Keep in mind, since my parents divorced and my dad moved there in 1998, PA is kind of like a second home for me in a lot of ways. I'm certainly far from clueless about the state. Not trying to go all "Naso" on the subject... but I can certainly remember a time where I went with my dad and a ton of his friends from the Philly 'burbs to a campground out in Lancaster (Spring Gulch, have you heard? It was very nice). The subject of the 2008 election and politics came up. The whole lot of them (15-20 middle-aged married people) were pro-McCain, pro-SSM. Not terribly significant, but certainly a bit of an insight.