Y'all can blame whoever the fuck y'all want. Palestine supporters, Latinos, rural voters, etc.
At the end of the day, the only person you can REALLY blame is Biden. His presidency was a disaster, and he didn't withdraw from the race until 4 months ago, when it was obvious for YEARS that he wasn't fit to serve another term. He prioritized his own interests rather than the interests of Democrats/Americans.
And Kamala is DUMB as fuck for aligning herself so closely with anti-Trump Republicans such as Liz Cheney and Dick Cheney these past few months. They had no influence on undecided/centrist voters whatsoever.
If the Democrats are smart, they'd start pushing REAL leftist policies going forward. But they're dumb as fuck so I see them going further to the right. Sad.