Political parties in the United States traditionally hold national nominating conventions to select their presidential candidates in the summer before every presidential election year. The delegates from each state choose the presidential candidates at the conventions.
The delegates start casting their votes for the candidate of their choosing, state by state, following a sequence of speeches and protests in favor of each contender. The party's presidential nominee is determined by who receives the first preset majority of delegates' votes. The chosen presidential candidate then chooses a vice presidential candidate.
Delegates to the national conventions are chosen at the state level in accordance with guidelines and formulas established by the state committees of each political party. The caucus and the primary are the two processes by which the states choose their delegates to the national conventions, despite the fact that these rules and formulas can vary from state to state and from year to year.
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