This is most often seen in science fiction shows and video games, where (as the title implies) there is a futuristic democracy where the president (or other leader) is a black...and bald guy. The rest of the "council" or "committee" or "parliament" will be completely or almost completely whitewashed, and he will be the only black guy there. Apparently, there is something about being both bald and black which makes a leader popular enough to be elected, and that something doesn't work when you only have one of the two. This can also apply to leaders of other sorts of groups as well, as long as those groups are "good".