Open-primary allows a voter to choose on election day which party they will vote for.
An open-primary is an election within which a voter either shouldn't formally affiliate with an organisation so as to take its primary or can declare his or her affiliation with a celebration at the polls on the day of the first whether or not the voter was previously affiliated with a unique party.
An open primary is an election that does not require voters to be officially affiliated with a selected party. Or, it's an election that lets a voter change their party affiliation before voting.
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