Over the past 18 years, the Democratic electorate has moved steadily to the left, as liberals have displaced moderates. Self-identified liberals of all races and ethnicities now command a majority in the party, raising the possibility that views once confined mainly to the party elite have spread into the rank and file.
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.
The percentage of Democrats who say they are moderate has fallen from 44 to 35; the percentage of self-identified conservative Democrats has gone from 25 to 13 percent.
Well-educated whites, especially white women, are pushing the party decisively leftward. According to Gallup, the share of white Democrats calling themselves liberal on social issues has grown since 2001 from 39 to 61 percent. Because of this growth, white liberals are now roughly 40 percent of all Democratic voters.