Put directly: Democrats had their chance to speak out against Biden running for reelection at nearly 82, they failed to do it and there is no “they” now poised to intervene.

The short answer as to why Biden is almost certain to be the Democratic nominee again is Donald Trump. The former president effectively controls both parties.

Trump is the Democrats’ best fundraiser, organizer, mobilizer and, importantly, force for unity. He is the adhesive that binds a coalition that ranges from the DSA to Bush Republicans, who are about to go over a decade since having voted for the nominee of their (old) party.

This centrality of Trump — and Democrats’ determination to block his return — is what insulates Biden within his own party.