I think it says a lot about a certain group of people, that it’s normally the Obama signs that disappear.
That’s a logical fallacy, as well as making assumptions based on an incomplete data set. Near my neighborhood, it’s the McCain signs that disappear. It also speaks in generalities about “certain groups of people.” In your case, it’s probably ignorant rednecks or racists, not critical-thinking Republican core people. In my case, it’s probably black people from the trailer park that want a free handout, socialized medicine, and racists. You’ll note, though, that these are isolated incidents that only speaks badly about a small subset of people, and not about an overall trend at all.
Even the the fact that you try to point it out as being an overall trend based on the logical fallacy and incomplete data shouldn’t be used as an indictment against the type of people that are supporting Obama in the first place, since you’re only a single individual and it would be unfair to assume that all Obama supporters are so misguided.