Kamala Harris, the 2.0 version, is self-assured, unflappable and funny. (To the hecklers at one of her recent rallies in Wisconsin: “Oh — you guys are at the wrong rally. No, I think you meant to go to the smaller one down the street.”) But being smart and compelling may not be enough in the scary closing days of this race. She can’t win against Trump just by having a successful record as a prosecutor and lawmaker and creative ideas about how to increase housing supply, support entrepreneurs starting businesses and help people buy their first home. And that’s maddening....