Like the "are they lying or are they stupid" chestnut, there's been some debate as to whether the current teabag/birther/deather wingnut crap is just more of the usual right wing hysteria as we saw in the 90s and since, or is to do with the advent of a dusky-hued occupant of the White House.
Personally I vote "all of the above." But anyhow, this sort of thing is pretty good evidence of a hysterical racial angle.