In 2008, Barack Obama won 95 percent of the black vote. Now, blacks voted in large percentages for Democrats long before that, of course, largely because of Democratic devotion to huge spending on social programs. But Obama’s election was unique. The black community, however, was also largely anti-same sex marriage. In fact, many commentators suggested that Obama’s presence on the 2008 ballot in California allowed Proposition 8, upholding traditional marriage, to win approval – blacks showed up to vote Obama, and cast their ballots in favor of Proposition 8 at the same time. Take the black population in Maryland, for...