Over the course of American history, the nomination procedure has evolved, frequently involving secret ballots.
In order to become the presidential nominee, a candidate typically has to win the support of the majority of delegates. This is often made possible through the party's state primaries and caucuses. State delegates to the national convention attend to cast their votes for the candidates of their choice.
People now take part in primaries or caucuses in 48 states to choose the delegates who will support their preferred presidential candidate. The presidential candidate who receives the highest support from state delegates is nominated at national party conferences.
The nomination procedure has essentially altered across American history from self-announcement, caucus, and convention to direct primary and petition. A Party nomination contest that is a closed primary allows only registered party members to cast ballots.
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