There is no clearer sign of the changing shape of the Democratic coalition than the fact that going into the 2018 midterm elections, six of the 20 richest congressional districts were represented by Republicans but that when the new Congress is sworn in, all 20 will be represented by Democrats.
The Democratic Party is continuing to extend its core support among minority constituencies — now 41 percent of the Democratic electorate — into upscale, often suburban, areas as college-educated white women abandon the Republican Party in droves and as education, more broadly, becomes a new partisan dividing line. CONT.
Thomas B. Edsall, New York Times