On Saturday, the Conservative Political Action Conference, or CPAC, will end with a straw poll. But given Donald Trump’s lock on the Republican nomination, attendees will not be asked who they want for president. They will be asked to choose between 17 possible vice-presidential picks. On Friday, four such names were on the speakers’ roster. “There are two kinds of people in this country right now,” the South Dakota governor, Kristi Noem, told an audience in general uninterested in non-binary choices. “There are people who love America, and there are those who hate America.” As an applause line, it worked...