The shocking thing about the 2020 primary being won by Biden winning the black vote and the south is that it's exactly why Clinton won the primary in 2016 and pretty much none of the other candidates learned a damn thing from the experience.
This is part of why I expect it to be Harris. The 2028 rogue's gallery is stumping in New Hampshire like it's 2008 and she seems to be the only one smart enough to head down South.