Here's a couple of links to articles that touch on the latest developments on the PA flap.
Pa. Voters Divided Over Obama Remarks
Decades of working-class neglect - now that's insulting [Update: Diaried here]
And the latest from Senator Obama:
The problem actually with this most recent episode is not that I was saying one thing behind closed door and saying something else in public. The truth is actually that I’ve made these same comments in a similar way on "The Charlie Rose Show" back in 2004 or 2005, and I had said it in town hall meetings in small towns.
The problem is that I just mangled it, which, you know happens sometimes. The point that I was making was actually two separate points that got conflated. - Obama misspoke but did not lie