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They have a Primary.
caucus
primary election
Violates the matching principle
The nominating method that is oldest is the 'self-announcement.' This is when the candidate announces his or her intention to run for an elected office.
A closed-vote primary (restricted to party members)
direct primary
General election
The earliest method of nominating a candidate for political office was known as a caucus or convention
Direct primary
Direct primary.
caucus :)