How could they replace Harris with anyone? The primary voters picked Biden/Harris and Biden stepped down so how do they select someone else? The new candidate would need to fundraise as the Biden/Harris campaign can't immediately dismantle and shift all funding to the new candidate at the drop of a hat. The new candidate would have had to make the connections to the delegates the Biden/Harris campaign had already done.

How do you think they could switch candidates to someone other than Harris months before the election?