At this point, you have to wonder if they're doing it on purpose.
Personally, I think they are. I wouldn't go so far as to accuse all the repubs of it, but I don't think the ones who are pulling this kind of shit are doing it by accident. Lets face it, in far too many places telling people that the niggers are going to take over and pay whitey back is a pretty compelling message. Even if they don't actually believe actual payback part, the fact that them darkies are getting uppity is galling enough to them.
The real question is do enough voters believe this, or is it doomed to fail? The sad thing is, I'm not sure what the answer is.