The Illinois senator lends himself to white America's idealized, less-than-real black man.
The Magic Negro is a figure of postmodern folk culture, coined by snarky 20th century sociologists, to explain a cultural figure who emerged in the wake of Brown vs. Board of Education. "He has no past, he simply appears one day to help the white protagonist," reads the description on Wikipedia.
He's there to assuage white "guilt" (i.e., the minimal discomfort they feel) over the role of slavery and racial segregation in American history, while replacing stereotypes of a dangerous, highly sexualized black man with a benign figure for whom interracial sexual congress holds no interest. As might be expected, this figure is chiefly cinematic — embodied by such noted performers as Sidney Poitier, Morgan Freeman, Scatman Crothers, Michael Clarke Duncan, Will Smith and, most recently, Don Cheadle. And that's not to mention a certain basketball player whose very nickname is "Magic."
