NATE SILVER: Why liberalism and leftism are increasingly at odds. “The old left-right coalitions have long been under strain as America has moved away from materialist politics to the politics of cultural grievance. The clearest manifestation of this has been intense polarization based on educational attainment (the more years of schooling, the more likely you are to vote Democrat). If, however, higher educational institutions and the ideas associated with them continue to become more and more unpopular, I’m not sure what happens next.”