Montana: State Republicans vote for closed primaries, for runoff elections | Billings Gazette
Irked at what they believe is Democrats interfering in their primary elections, state Republican Party delegates on Saturday called for closing their primaries and allowing only registered Republicans to vote in them. Delegates also voted to support a second measure calling for quick runoff elections in general elections between the two candidates with the most votes. Runoffs would take place if no one in the general election won the majority of the votes. Neither resolution will take effect unless the Legislature passes laws to implement them or a court orders them. They simply reflect the viewpoints of a majority of the 207 convention Republican delegates present. The resolution for a closed Republican primary sparked a debate.

