Today, South Carolina Republicans cast votes in the 2016 presidential primary. As expected, two things happened. First, Donald Trump wiped the floor with the competition. Second, pundits have overreacted in declaring that his second win clears him a path to the nomination. The latter is not only premature, but rabidly underestimates how the party primary system works. But in due fairness, let's address both points. Trump continues to be underestimated This is not a post to bash Donald Trump. In fact, as a student of elections, Trump wildly impresses me. He entered a crowded race in which Republicans had not...