We could also say:
he is a very angry half-black man
or
he is a very angry half-white man
I can't understand why he's considered black, when he could just as easily be considered white. He isn't really the 1st black candidate, he's the first half-black (or half-white) candidate.
hmmm, in the old days when the dinosaurs roamed the earth and we didn’t have to be so PC, he would have been referred to as a mulatto