the most plausible explanation I've seen so far - credit to this post (from one of the hosts of the 5-4 podcast) where I saw it first:
my suspicion is that Kamala is floating a CA governor run or 2028 run not because she thinks she has a chance but because it will help convince wealthy donors that it's still worth buying influence with her and thus help her fundraise to pay off her campaign's debts
but also Kamala ending up as the nominee wouldn't surprise me. if it's not her, there'll be a different "establishment" Democratic candidate that the DNC puts their thumb on the scale for. 2028 seems likely to be yet another "this is the most important election of our lives, it's crucial to the future of the country that you vote for whichever Democrat we tell you to vote for, now shut the fuck up and stop complaining".
putting this in the context of other committee fights the Democrats have been having:
77-year-old Jerry Nadler was the top Democrat on the House Judiciary Committee (which also plays a crucial oversight role)
Nadler's leadership was successfully challenged by 62-year-old Jamie Raskin.
so Democrats' version of "younger blood" was to replace a baby boomer (born 1947) with...a slightly younger baby boomer (born 1962, which depending on where you draw the line is the last of the baby boom, or the very beginning of Gen X)
Raskin had previously been the top Democrat on House Oversight, so that spot became vacant.
Alexandria Ocasio-Cortez ran for that leadership position on House Oversight. she's 35 years old, has an excellent media presence, and is well-known nationally.
instead of AOC, Democrats chose a 74-year old, Gerry Connolly.
and not just any 74-year old...they chose a 74-year-old who has cancer
and not just any 74-year old with cancer...a 74-year-old who has an especially deadly form of cancer
and not just any 74-year old with an especially deadly form of cancer...esophageal cancer. cancer of the esophagus. you know, that thing that's in your throat. you know what else is in your throat, right next to your esophagus? your voice box. that thing you speak with.
Democrats in a nutshell: the guy we put in charge of oversight of the Trump administration...there's a good chance he's going to have surgery that renders him physically incapable of speaking.