It's a hyperbole. Simething I frequently use.
As a presidential candidate (or as a person who is of any real societal worth), you don't go freaking making "hyperboles" (his message was actually very literal in my opinion and he deserves no BOTD) disrespecting the deeply scarring history of a whole demographic of Americans.
It's downright stupid, and I'm saddened, albeit not surprised, to see you defending such a disgusting display of ignorant rhetoric.
Perhaps I don't see it as ignorant rhetoric. Interestingly enough, I didn't think for one second he was trying to say that slavery was better than what the African Americans have now. It's in the eyes of the beholder, I guess and you need to be a member of the PC police to be outraged.