Yes, votes can be changed. Often there are several votes taken at the convention, but the Republican convention this summer was all ready predefined. When a state gave votes to another candidate the votes were counted FOR Trump not the person named by the state. This happened to Utah. Go watch the convention voting online if you don't believe this.
The parties nominate a person for president and Vice President. Each state has a section and the state delegation will vote. On the first vote they have to vote for the person they are delegates for, but after that they can change their votes.
Where delegaters go vote for a presidential candidate.
So the candidate's home state can cast the winning vote.
In the French Revolution, the National Convention or Convention, in France, comprised the constitutional and legislative assembly.
These people are referred to as delegates to the convention.
National Covention.
These are the people who will attend the convention for their states and will vote as a block for the candidate to run for president.
congress or a national convention two-thirds vote of congress
delegates vote to nominate a presidential candidate
delegates vote to nominate a presidential candidate
This refers to the system where the results of primary elections direct delegates to vote at the national convention to select the candidate for the presidential election.
Non-binding primaries is when states can select candidates to a specific state convention and then select delegates for the national convention. Binding primaries is when all of the delegates must vote for a candidate at the national convention.