To win them, you must defend your unworkable plans dauntlessly.

NRPLUS MEMBER ARTICLE T he early stages of the Democratic presidential-nomination contest were dominated by the brute fact of former vice president Joe Biden’s lead among the (partly overlapping) categories of economic and cultural moderates and African Americans. That made college-educated white liberals a crucial constituency for Elizabeth Warren, Beto O’Rourke, and Kamala Harris. Warren’s candidacy has endured because she carefully and consistently went after these voters, while Beto and Harris misunderstood and offended them.

College-educated white liberals make up the majority of the most affluent, secular, and ideological segment of the Democratic electorate. White liberals have become more extreme over the past ten years. …