The bottom line seems to be that he's black. Seriously. I had honestly thought most of America was beyond this already, but if you pressure these retards long enough, that's where it eventually leads because NONE of them can back up anything they're shouting.
But they can't come right out and say it, so they label him anything else they can think of--a socialist, a muslim, etc. They kind of gave it away when they wouldn't let go of the Nigerian thing, though.