This is all a long preface for setting up notice of Thomas Edsall’s column in the New York Times today, Over the past 18 years, the Democratic electorate has moved steadily to the left, as liberals have displaced moderates. . . From 2001 to 2018, the share of Democratic voters who describe themselves as liberal has grown from 30 to 50 percent, according to data provided by Lydia Saad, a senior editor at the Gallup Poll. . . Well-educated whites, especially white women, are pushing the party decisively leftward. According to Gallup, the share of white Democrats calling themselves liberal...