If progressive whites are defecting because they are uninspired by Democrats, moving further to the right will only deepen their disillusionment. But if the next D.N.C. chairman can win them back, the country’s demographic trends will tilt the field in Democrats’ favor. As Mrs. Clinton’s popular vote margin showed, there is still a new American majority made up of a meaningful minority of whites and an overwhelming majority of minorities. Not only is there little evidence that Democrats can do significantly better with those white working-class voters who are susceptible to messages laced with racism and sexism, but that sector of the electorate will continue to shrink in the coming years. Nearly half of all Democratic votes (46 percent) were not white in 2016, and over the next four years, 10 million more people of color will be added to the population, as compared with just 1.5 million whites.

Keith Ellison, a D.N.C. chairman candidate, has a proven record of engaging core Democratic voters rather than chasing the elusive conservative whites, and the party would be in good hands under his stewardship. (Thomas E. Perez, the former labor secretary, has less electoral history, but his reliance on political superstars such as the strategist Emmy Ruiz, who delivered victories for Democrats in Nevada and Colorado, is encouraging.)