A different nominee would be free to name their own VP I think.
"Watching the DNC finally turn on the Bidens, now that they have gotten all they can get from them, is a beautiful thing. Get out the popcorn wagon, because watching how they resolve the Ca.Ca Kamala problem will be even more entertaining. I'm guessing a large cash payment to get her to resign before Joe is forced to, followed by installation of some equally inept clod like Nattering Newsom as VP, who then becomes President when Joe calls it quits in mid-2024."