PA is a coal state. I’ve seen a ton of Stop the War on Coal signs... The poll that has Bambi leading by 10 was based on a model of 39D 27R 28I. The Dems have been fighting the Voter ID law like crazy because they know that they can not win PA in a fair election.
I have not seen many Romney signs in my end of Allegheny County (other than my own), but I see very many anti-Obama signs. “Keep America Free - Fire Obama” and “Stop the War on Coal - Fire Obama” and the ones I see most. By the same token, I have not seen a single Obama sign. I’ve only seen a handful of bumper stickers, mostly the 2008 stickers. Only have seen a couple 2012 Obama stickers. Have seen a handful of Romney stickers and a bunch of anti-Obama stickers.
Coal and the Keystone Pipeline could definitely be issues where PA voters are turning against Obama.