I just puked a little in my mouth looking at the options presented.
RFK Jr?
RFK Jr has been kicked out of the Democratic party for running against Biden.
Kennedy Jr is a confirmed leftist, but one who questions and disagrees with "big pharma" and his VP choice is a hard left socialists.
The Democrats are afraid of running Kamala Harris. She is a total disaster with polling numbers as bad as her failures. I think the idea of Biden collapsing, puking or performing poorly in the debate would allow the Democrats to have a "brokered convention" after the upcoming debate. Harris is tied to Biden, and she would effectively be forced to go down with his ship in a brokered convention.
That type of convention opens the door to a new candidate. I would guess it would be failed ex-San Fran Mayor and failed current California governor Gavin Newsom. Gretchen Whitmer might be an option as well. NY governor Hotchel is another possible alternative. Michelle Obama would win, but has said she doesn't want the job; I think she already has it as a puppet master and is enjoying that position, I think she and Barack would maintain that puppet master position if they put up Gavin Newsom as the Democratic choice.
Newsom is hard left, politically correct and very connected to Hollywood and Silicon Valley, looks handsome, knows all the power brokers in the Dem party, and can string together 3 sentences. He is about as intellectually deep as a shallow puddle, in a debate he can make a good impression for about 10 minutes but can't stand up to facts. That makes him perfect for a liberal. He can spout off 'headlines' that sound good, but his actual policy is shiite.
Just my 2 cents.