The only way this happens is for Joe to agree to release them (send out word, not that they are legally bound) and to put his efforts behind someone. How that wouldn't be Kamala is beyond me as they'd either have to pick her or place her into something else first. Unless there was suddenly a vacancy on the S.Ct. (and I don't see how they'd get her through the confirmation process that fast before the convention), it's got to be something pretty creative. And then, who would it be that would even agree to get stuck in that position who realistically thinks they could go forward next time after likely losing to Trump the first time they run as a substitute? That leaves the world's smartest woman. Bottom line is I think we are stuck with the existing choices unless Joe gets even worse and he has to announce he's ending it in Jan or even before and Kamala steps into both the Oval Office and the nomination.Yes, it would be trying to pick someone else. Two things would have to happen first. The biggest one would be someone would have to actually agree to be a replacement. The second would have to be delegates on the floor would have to vote against who the voters voted for in the primary. The biggest hurdle for that is most of those delegates were put in place by the Biden administration.