Don’t let Hillary Clinton’s victory in South Carolina and on Super Tuesday fool you. Her support from the black community has been strong in the primary race so far. Nonetheless, this community’s current loyalty is based on an outdated ideological model. The politics of grievance alone will no longer work. She is simply a more substantive candidate than Senator Bernie Sanders. Unlike her husband—famously dubbed the “first black president” by novelist Toni Morrison, Secretary Clinton does not appear to have the monolithic black support that Democratic frontrunners often take for granted. A surprising number of high profile black leaders have...