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Alaska - Open Primary: Parties select who may vote in their primaries. To vote in the GOPprimary, a voter must be registered as a Republican 30 days beforeElection Day.

Georgia - Open: No party affiliation required at registration. However, on ElectionDay, voters must declare an oath of intent to affiliate with theparticular party for whom they are voting on Election Day.

Idaho - Closed: Until 2011, all Idaho primaries were open. Independents intervened in a lawsuit brought by a faction of the Republican Party seeking to close their primaries. However, the GOP obtained adeclaratory judgment that mandating open primaries violated freedom ofassociation and was thus unconstitutional in Idaho Republican Party v. Ysura. Subsequently, the legislature passed a bill allowing parties to choose which type ofprimary they use. Democrats have chosen a semi-closed primary;unaffiliated voters may register a party at the polls on election day,but they are bound to that party affiliation at the next election.

Massachusetts - Semi-Closed: Affiliated voters must vote in the primary of their party; however, unaffiliated voters may vote in either primary.

North Dakota – Closed: The only state without voter registration. To vote in the Republicancaucus you must have affiliated with the Republican Party in the lastgeneral election or intend to do so in the next election.

Ohio - Closed: Voters’ right to vote in the primary may be challenged on the basisthat they are not affiliated with the party for whom they are voting inthe primary.

Oklahoma - Closed: Only voters affiliated with a particular party may vote in its primary.

Tennessee - Open: No party affiliation required at registration. 

Vermont - Open: No registration by party. For presidential primary, voters must declare which ballots they want.

Virginia - Open: No party affiliation required at registration.

source: FairVote

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