Two candidates have filed for U.S. Senate in the Montana Libertarian primary. Montana requires parties with ongoing ballot status to nominate by primary, but does not actually print up primary ballots unless there is a contest. See this story, which says that Montana hasn’t printed up primary ballots for any qualified party, other than the Democratic and Republican Parties, since 1996, when the Reform Party had a contested primary. The story also says the Secretary of State will try to avoid a Libertarian primary and is considering listing both candidates on the November ballot.
The odd part of this story is that neither the Secretary of State, nor the legislator who is quoted in the story, seems to have thought that a good solution would be to let small qualified parties nominate by convention. The Libertarian Party has candidates for a majority of the statewide offices in Montana this year, but only in the U.S. Senate race is there more than a single candidate from that party. Thanks to Mike Fellows for the link.