Sarah Palin, the former Alaska governor, is among the more natural populist politicians of our time, frequently critiquing elites in the press, the Democratic Party, and the Republican establishment. It is one of the reasons — along with her working-class background and the sense of authenticity that she can often convey — that she is so popular with some voters. One potential problem for Ms. Palin, however, is that plenty of well-to-do and well-educated voters — those whom we might think of as belonging to the elite — will be participating in the Republican primaries. Three recent surveys of Republican...