IDAHO

Primaries:

• Democratic congressional and state primaries: mixed
  

• Republican congressional and state primaries: mixed

• Democratic Presidential primary: mixed

• Republican Presidential primary: closed
  

Primary Type Definitions

Registration:

• Voters may or may not choose to affiliate with a political party when they register to vote.

• 35% of registered voters in Idaho are unaffiliated.

Details of voting in congressional and state primary elections:

• The Democratic Party allows registered Democrats and unaffiliated voters to participate in their primary.
• The Republican Party only allows registered Republicans to participate in their primary.
• The Constitution Party allows unaffiliated voters to participate in their primary.
• Idaho offers same-day voter registration, so an unaffiliated voter may affiliate with a party up to or on election day and vote on that party's ballot.
• Party affiliated voters seeking to change their affiliation must do so before the 10th Friday before an election.