From a Washington Post column by Jason Willick headlined “How the diploma divide came to dominate American politics”:

The most important U.S. political trend of this century is the march of college-educated White voters toward the Democratic Party — and of non-college-educated White voters toward the GOP. This trend hasn’t just changed election arithmetic; it has changed the way the right and left argue, pushing the Democrats to embrace experts, business and the status quo as Republicans grow increasingly at odds with established institutions.