A primer:
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The Caucus
Caucuses were the original method for selecting candidates but have decreased in number since the primary was introduced in the early 1900's. In states that hold caucuses a political party announces the date, time, and location of the meeting. Generally any voter registered with the party may attend. At the caucus, delegates are chosen to represent the state's interests at the national party convention. Prospective delegates are identified as favorable to a specific candidate or uncommitted. After discussion and debate an informal vote is taken to determine which delegates should be chosen.