I can vouch for NC. 2008 there were Obama stickers on cars all over Greensboro. I've seen exactly 2 this year and one of those was a brochure taped to the rear windshield. No yard signs for Obama. Where I live I am seeing Romney yard signs and I am seeing Romney bumper stickers everywhere.
I'm in central NC, too. I was at a small town "festival" over the weekend. Granted, it's a fairly conservative small town, but still...
I saw plenty of Republican candidates with booths there. Lots of "Romney" signs.
Obama didn't have a presence at all. And, I don't know about *all* the Dem candidates (I'm not familiar with all of the locals) but I didn't see any presence for Dem national or state offices either.
I was a little surprised, this would be a good place for them to move the needle, as it were. Instead, Nada.