A couple of times Beck has hosted a large group of black conservatives. Seems like one of his guests brought up that MLK was a communist.
I just don’t expect Beck to give it the same amount of attention that he gives other folks. It would be very divisive and lead to organized attacks against Beck. Even though its true, IMO.
(I've seen the shows where he hosted Black Conservatives; in the first one, there were members in the audience who admitted they voted for Obama.)