And you can bet your patootie I'm going to be there as #2 backup for my Berners.

are finalized at the state conventions, as far as I am aware. All counts prior to those conventions are just estimates. Generally, those estimates turn out to be very close to the final numbers, but there can be shifts of one or two delegates at the conventions.

Generally, though, the Democratic Party strives very hard to make the delegate count match voting results as closely as possible, percentage-wise. Some rounding takes place, of course, due to the small number of delegates and the relatively larger number of voters.

Convention delegates, too, can change allegiance, and some do, although the goal remains matching voting results and the national delegate allocation. I can't speak for all states, but I know Minnesota, and most people wouldn't believe how intent the state convention goers are in getting the delegate allocation right.