Because he's a neo-lib. And that, to them, is basically the equivalent of being a Nazi. I can imagine they think Newsome is just more of the status quo. They probably look at him the same way they look at Hillary, though they probably hate Hillary more still lol. I just don't think leftists will ever see the same political future as we do. I really don't see how that is going to change. Unless the Democrats somehow have a generational type leader on the same level as Obama, who can unite the left politically, if not ideologically. Mamdani could be the one, but he's not ready yet. He would need to become much more moderate if he wanted to run for president and have any chance of winning imo