The Joker’s makeup in “Dark Knight” — the latest film in a long franchise that dramatizes fear of the urban world — emphasized the wounded nature of the villain, the sense that he was both a product and source of violence. Although Ledger was white, and the Joker is white, this equation of the wounded and the wounding mirrors basic racial typology in America. Urban blacks — the thinking goes — don’t just live in dangerous neighborhoods, they carry that danger with them like a virus. Scientific studies, which demonstrate the social consequences of living in neighborhoods with high rates of crime, get processed and misinterpreted in the popular unconscious, underscoring the idea. Violence breeds violence…

Obama, like the Joker and like the racial stereotype of the black man, carries within him an unknowable, volatile and dangerous marker of urban violence, which could erupt at any time. The charge of socialism is secondary to the basic message that Obama can’t be trusted, not because he is a politician, but because he’s black.