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A closed primary is a type of election where only registered members of a specific political party can vote in that party's primary election. This contrasts with an open primary, where voters can choose which party's primary to participate in, regardless of their own party registration. Closed primaries are designed to promote party unity and prevent members of rival parties from influencing a party's candidate selection. This system ensures that only those affiliated with a party have a say in choosing its nominees.123

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