I never understood why people are so favorable about Newsom's chances. America is predominately a working to lower middle class country. Everything about Newsom and his wife oozes elite, rich, privileged Marin, California liberalism. This isn't Clinton slickness charming people with his love of fast food and black music, or awe shucks folksy but privately wealthy Bushes, it's a completely different level of slick privilege that oozes out of every orifice of the Newsoms and is going to turn off a lot people every time they see him. The people in flyover, the people in working areas, both urban and rural. And black voters aren't going to whore themselves via ballot harvesting once they see shiny, blond, ditzy Mrs. Newsom.
You are right there is a real appetite for populist policies and leadership among the rank and file Democratic base. But that populism is being conquered by the DSA, who are wackos and anti-semitic and often genuinely scary people. The party seems increasingly headed for a civil war of some kind. The clear majority are the moderates, but they can't win without the populists, who are now dominated by the DSA left, and the DSA won't support anything unless they get their way. We've seen this political dynamic play out many times before.
You can see a narrative pattern starting to emerge, Democratic takeover of the house emboldens the DSA, the party gets bogged down investigating Trump on everything under the sun and a couple impeachment attempts but achieve nothing but even worse approval levels for themselves, which the DSA argues means the party isn't radical enough, but the party blames it on the loud DSA members. The moderates attempt to nominate Shapiro, DSA refuses him because he's Jewish and is too moderate, civil war breaks out, to herd off electoral disaster who steps in but Harris, attempting to sell herself as a bridge between the moderates and DSA.
Meanwhile the Republicans nominate probably Rubio (based on internal speculation that Vance won't run because of his new baby). Harris and the Dems will want to make the election a referendum on Trump and the past, but Rubio will say I'm talking about the future. And guess who wins?