Starting Jan. 20, the most powerful person in the world actually will be a black man. Although President Barack Obama is one of the greatest public speakers now practicing that art, he probably couldn’t get hired as the anonymous voice-over spokesman for a brand of cereal because he doesn’t sound black enough. Nevertheless, he is a beneficiary of this development. When God turned into an African American, it became less unthinkable that the President might be African American as well.