It playing into the elistist perception. Maybe 1-2 points.
Wait, you actually believe that his logo or accepting in a stadium will cost him votes?!
I think that both reinforces the image that Obama is elitist, and that image will cost him votes.
There is a good historical example. In 1992, GHW Bush was campaigning in a grocery store and expressed surprise on how bar codes could read products. This was widely reported and helped reinforce the image that Bush was out of touch, and elitist. He wasn't like the "common people," or so the story went.
Now, in reality, you don't really expect the President or VP to be making runs to local 7-11 for beef jerky, but it still created the image that Bush was elitist.
Obama has a similar image problem. The logo, in a minor way, helps create the image. The stadium has the potential for really doing it. There have been a string of events that have helped create this image of Obama, and it is ultimately a political negative.