It's not surprising...
When "moderates" run one party, the other party goes further in the other direction to compensate.
So when neoliberals took the Dem party to the right. And people stopped getting helped by them, they turned to the only other option.
Biden and Kamala doubling down and insisting that everything was great made that even worse.
Because for the vast amount of Americans, shit is not ok.
It was harder to believe Biden/Kamala lying that everything was fine than it was to believe Trump's lies about whose fault it was. To a lot of people what mattered is trump admitted shit needed to be fixed, and Biden/Kamala couldn't (or wouldn't) do that