If the candidate with the overwhelming majority of pledged delegates withdrew and released those delegates there’s no mechanism to automatically give it to someone else, there’d be a mad scramble to win over those delegates.
Calling it a “mini-primary” is more polite than “absolute shitshow”
This seems like a big deal?
"Responding to a question on CNN about whether Harris should be the party’s automatic nominee if the president were to step aside, Clyburn (D-S.C.) said: “Well, I think we’re going to have a mini-primary leading into the convention.”
I think common logic is Harris at the top of the ticket doesn't necessarily add many voters to the die hards Biden isn't going to lose.
At this point, I'm not convinced Biden withdrawing is going to be more damaging than him staying in, but it's anyone's guess who steps in if he pulls out.