Writing for the very leftwing Salon, Amanda Marcotte entitles her column, "Kamala Harris is right: Biden set her up to fail." Well ... her title is right although her description of how that came about leaves out that her defeat was Biden's revenge on a party that had thrown him - their supposed leader - under a bus.
Joe Biden gave Kamala Harris a ringing endorsement when who the Democrats would choose post-Biden was still up in the air. The fact the generous early campaign contributions were all in his name made his endorsement much weightier than it otherwise would have been.
Biden is a doofus, and mentally foggy to boot. Still, he had spent four years closer to Kamala Harris than most of us, and had doubtless noted her near inability to perform as a campaigner, or as much of anything else.
Biden's endorsement of Harris was entirely cynical. Her performing down to expectations brought about the desired outcome, a Democratic loss that was decisive (312 to 226 electoral votes).
Call it "Joe's revenge" on a party to which he'd been loyal his whole life. When things got ugly, Democrats didn't reciprocate his loyalty.
It turns out he had a dirty trick left when the need arose, and he played it. I like to think Trump would have won regardless, but it would have been a much harder slog against a more able candidate.
Misery loves company, and revenge is a dish best served cold, consumed at leisure. Each Democrat outrage at a Trump action is another morsel of delight at Casa Biden where the banquet is scheduled to last another 3+ years.