Anti Trump voters are there for a candidate who is capable of getting them
Other than loyal Democrats, Biden has lost them forever. His debate faceplant was so apocolyptic there is no recovering from it. He would have to suddenly become the Joe Biden of 20 years ago, and that won't happen.
I'll take any of those seven candidates. I have reservations about Buttigieg because this election is too important to try and break social barriers. I really like Whittmer, and maybe a moderate African American VP with her. Solidify the women and African American vote. Get the youth, the undecided independents and the Haley voters who Biden has lost irretrievably.