The Montana Newspaper Association and Montana Public Broadcasting System will jointly sponsor general election debates for U.S. Senate and U.S. House on June 14, Saturday. All three candidates in each race (the Republican, Democrat, and Libertarian) will be included. The debates will be in the Library Auditorium at Montana Tech in Butte, and will be broadcast on Public TV. See this story.
That article doesn’t actually say that the 3 candidates will take part. This one has more perspective on the issue.
http://billingsgazette.com/news/state-and-regional/montana/libertarian-to-be-at-st-u-s-senate-debate-drawing/article_7454bc0b-4422-5137-831a-3239cb12b867.html
Yes all 3 have been invited. It seems the Montana Newspaper Association has been good over the years in inviting all candidates on the ballot. In 2006 incumbent US Senator Conrad Burns was off on a fund raiser and you had Jon Tester and Stan Jones debating an empty chair. Conrad Burns lost the election that year, in part, many think because he cared more about raising money then speaking on the issues.
I wish that would happen more often. My US Congressman has not appeared at a public debate or forum in the last two elections but he keeps getting reelected and it is driving me nuts.