@CoffeeA
Being Pragmatic, Biden got the overwhelming majority of votes in the Democratic primaries last spring.
Voters knew they were voting for Biden/Harris and that she would take over if he could not complete a term.
Voters who were opposed to Harris could have voted for another candidate or uncommitted.
The Rules of the Party are published and not a surprise, but many people Don other to discover what they say until something unusual pops up.
Having been Rules Committee Chairman in the CT State Democrat Party and on the national Party Rules Committee in the past I am more aware than the average voter.
If delegates chosen by the state parties do not want to vote for Harris, they are not bound to do so. However, the vast majority of delegates will vote for what is best for the Party in order to retain the White House. At this point that seems to be to nominate Harris as the Democrat Presidential Candidate.
This has been the consensus of the many conversations, texts, emails that I have had with colleagues across the country.
As I often preach and point out, America is not a Democracy and does not operate as one (with the exception of a few small New England Towns still run by Town Meetings). America is a Republic. Voters elect representatives (in this case delegates) to represent them and the representatives are empowered to cast votes based on current information and developments at the time of the vote. No delegates were elected based in an unwavering commitment to vote Biden. In fact in most states delegates are not elected, but the State Party appoints them based on the results of the primary vote. Again there are also Super Delegates who hold voting rights based on office and may not reflect the results of a primary.
I am not here to electioneer, my explanations are here as an educational service to CR readers. I never try to persuade anyone here to vote for or against a candidate or Party. I have voted a split ticket in virtually every election since 1972.