With reluctance, because he is a good and honorable man of great personal courage, I do not believe that Joe Biden has the needed energy, mental agility and nimbleness. Nor do I believe that the nation of can-do strivers I described above is ready for Bernie Sanders’s “democratic socialism.” Forms of socialism work in Europe, and the word is widely misunderstood in America, but socialism and America’s essence are incompatible.

Elizabeth Warren’s couching of a campaign for radical change as “economic patriotism” is a much smarter way to go, and her energetic advocacy of ideas to redress the growing injustices in American life has been powerful. Still, I am not convinced that enough Americans are ready to move as far left as she proposes or that she passes the critical commander in chief test.

Kamala Harris does that for me. The California senator is a work in progress, with uneven debate performances, and policies, notably health care, that she has zigzagged toward defining. But she’s tough, broadly of the center, has a great American story, is passionate on issues including immigrants, African-Americans and women, and has proved she is not averse to risk. She has a former prosecutor’s toughness and the ability to slice through Trump’s self-important bluster.