"In SW Ohio, there are virtually no Obama yard signs or bumper stickers... a few scattered here and there – nothing like 2008. Not many Romney signs either for that matter, but more than Obama for sure. Lack of enthusiasm for either candidate?"
Purely anecdotal evidence, but I'm hearing the same kind of thing in certain other states. There seem to be far more yard signs for Republicans in local and Congressional races than for Romney, and lawns that have signs for Conservatives in local races don't always have Romney signs. Maybe it's too early for people to get focused on the national race- I don't know.
I think Republicans will vote straight ticket, so I don't foresee it as a problem- still, I think people are waiting for Romney to be more forceful in taking a stand and making his case. (And "taking a stand" doesn't mean you have to take a questionable stance that you have to be defensive over- just take an all out assault on Obama's failures, and keep pointing out that things will never get better under Obama). Romney needs to show that "he's the guy"...
Here in my part of Ohio, we’ve had our local yard signs for a while and just are getting our Romney/Ryan ones this week.