I thought that during the 2020-2024 interim the Democrats were supposed to be building someone up for the next generation of the party. To no one's surprise, they've been doing exactly fuck-all for four years - but, for insiders who actually care about the party's future, who are they hanging their hat on? Voters' confidence in Kamala has tanked; Cuomo was maybe their man until the sexual harassment charges hit (side question: how was he able to skate on the nursing home scandal?). But anyway, who's the next empty neoliberal they'll run in future elections?
Yeah Beto has also been vocally anti-Israel lately as well, but he's also not had any hope of a legitimate political career lately. That can't be making him friends with Democrats. He kept losing every race he was involved in, so the donors dried up.
Also in the 2020 primary there were so many candidates he had to pigeon-hole himself to one particular issue to be notable, he tried being the anti-gun guy. He did the thing Democrats aren't supposed to do which is confirm what Republicans think of them. Democrats are usually more submissive and conciliatory to Republicans. When accused of being anti-gun Democrats are supposed to be like "oh well uh, well, yeah you're right mr. republican we should still protect the blah blah." Instead Beto was outright saying "yeah we are coming for your guns, no one needs an assault rifle" and that probably didn't make him friends among the rich donor class who actually control everything
They went with Biden because they simply don't have anyone left