I’m not sure what election you participated in, but my ballot listed Joe Biden at the top of the ticket.
So this is an opportunity for you to learn how it really works. Harris was just officially voted to be the Dem candidate and that will be official on Monday.
Nothing forces Trump to be president. He can quit any time he wants.
Oh, he could abort himself, but you know that’s never going to happen. The party is stuck with the weirdo until the election, otherwise.