A zombie candidate will be just fine by most Democrats and leftists in 2024. From Victor Davis Hanson at amgreatness.com:
For the Left, having virtually no president at all certainly has its advantages. With no one in charge, everyone is in charge.
We start with the likely American landscape over the next two years.
Joe Biden has no choice but to focus on a purely negative message. So we already know his talking points for the next 18 months: “ultra MAGA” demons, “semi-fascist” insurrectionists, Trump!, Trump!, Trump!, and more Trump!, murdering fellow Americans by putting limits on partial-birth and early abortions, “censorship” as banning critical race theory indoctrination and grooming books, inciting racial tribalism, along with the corollary old boilerplate triad of isms—“fascism, sexism, and racism!”
There will be no Democratic primary debates, even if support for Robert Kennedy, Jr. surges to 25-30 percent of the Democratic electorate. The latter is banking on his name, his gut instinct there are still some JFK-like Democrats and Independents in hiding, the decline of Joe Biden, and the pushback against all things woke.
Biden is failing at a geometric rate of enfeeblement and would likely not be able to rest up, medicate, and prep full-time to salvage the debates as he did as a candidate in the attenuated debate series of 2020. His handlers do not wish to tempt fate a third time and hope that if it comes to a Trump-Biden race that they can goad Trump into offering an excuse to curtail or cancel the debates entirely.