Voters in an open primary (like August) are given a ballot with a column listing each qualified party’s candidates. Voters then decide which party primary they wish to participate in by voting only in the column of their party choice while in the privacy of the voting station. Voting for candidates in more than a single party’s column will void the entire partisan ballot.
Voters in closed primaries must state the party primary they wish to participate in before being issued a ballot. The ballot given to voters only has candidates of the party that corresponds to the voter’s choice.