Thinking about (and researching) these people has clarified my thinking somewhat. I will, of course, vote for the Democratic candidate, irrespective of who that may be. That said, I hope that person is not Biden, Gabbard, Sanders, Steyer, or Yang. I find myself being more kindly disposed toward Booker, Harris, and Klobuchar. At this juncture, however, I doubt that Booker will win the Democratic nod.
Perhaps the November debate will narrow the field.