A top-two primary, but only for U.S. Senate, and only for 2024. That’s in one bill that Montana legislators advanced on Monday.
A second Montana bill advancing Monday would raise thresholds for parties to qualify for the ballot, and raise signature requirements for parties not yet qualified.
In 2018, the Libertarian candidate drew 3% of the vote for U.S. Senate in a 50-47 contest. But I’m sure that’s coincidence.