Do the parties have any legal responsibility to nominate the person that gets the appropriate number of delegates, or is it just the expected/accepted outcome?
I think the parties are free to set their own rules for how the nomination process works, but I suppose a candidate who got the most delegates but was denied the nomination could sue for one reason or another. ‎- John B.
The delegates themselves usually sign something committing to vote for the candidate they are the delegate for, but I don't remember how binding it is. ‎- Jennifer D.