If Donald Trump manages to win the general election in November, historians of the future may trace the start of his march to victory to May 13, 2016. That was the day the Obama administration announced that all public schools in the country would have to provide transgendered students access to the bathroom of their choice or face a loss of federal funds (and possible Justice Department lawsuits under Title IX). But how could this be, when Trump's position on this and other culture-war issues is wishy-washy at best? Because in recent years elections have been increasingly fought and won in negative terms, with most people voting in favor of one party not so much because they love it as because they despise the other side.