“The very presence of Mr. Pence — whose views on immigration, like those of Mr. Trump, are anything but celebratory — at this particular show (one previously embraced by the Obamas and Clintons) would seem to signal that an unspoken debate was going on that night. In that case, wasn’t Mr. Dixon belaboring the obvious in delivering the statement prepared by him and his associates (including Mr. Miranda)? Was what he said a condescending equivalent of supertitles for the inferentially challenged?”