Many commentators have noted that the Democrat primary and caucus electorate in the three contests held so far is much more liberal than its counterpart when the Democrats last had a contest eight years ago. That’s true: The percentage of liberals among Democratic electorates has increased from 54 percent to 68 percent in the Iowa caucuses, from 57 percent to 68 percent in the New Hampshire primary and from 45 percent to 70 percent in the Nevada caucuses.