FWIW - I happened to be in Wilmington, DE (I’m from the pacific NW) yesterday driving around and saw zero, zilch, NADA obama signs but tons of Romney signs.
I'm in CA (SF East Bay Area) and I am skeptical of the "deep blue" CA on that electoral map. In one of the most liberal congressional districts in the state, the old stomping grounds of Ron Dellums, I am seeing BO bumper stickers on fewer than 1 percent of the cars. There are almost NO BO yard or window signs. I drove down a street that had a BO sign out in front a few weeks ago and today it wasn't there. No Romney signs or bumper stickers around, but people don't want their property vandalized.
Only in a small community with a responsible and responsive police presence will you see Romney signs in yards (sometimes more than one sign in the same yard -- I will not name where this is, out of a desire to protect the residents and their freedom to express their political preference on their own property).
If the mood is like this in CA-13, I have doubts about that color on the map. It should be no more than light blue, maybe even a tossup. Who knows? There are MANY grim people around here.