Lot of speculation (either over Michelle Obama or Gov Newsom) being ready at the convention for the Biden-exit to occur. If you see Michelle lined up for the key-speech on night #1...then Joe is expected to send a signal.
I would imagine if you asked a hundred 2020 Joe-voters if they can return and vote for him again....thirty of them will likely be voting RFK Jr.
Mark your walls with this: Michelle Obama WILL BE THE DIM NOMINEE!