Minnesota has three ballot-qualified parties, all of which will choose their nominees on primary day, August 10. On July 2, TPT, a public television station in Minnesota, sponsored intra-party gubernatorial debates. See the one-hour broadcast here.
However, the TV station determined that only the Democratic-Farmer-Labor Party, and the Independence Party, have significant intra-party contests for Governor. So, TPT held a 25-minute debate between two leading candidates for the Independence Party nomination, as well as a 25-minute debate between three leading candidates for the Democratic-Farmer-Labor nomination. The station determined that in the Republican primary, only one candidate has a strong campaign, so it did not hold a Republican debate, but instead broadcast a 10-minute news story about that one Republican.
The Independence Party gubernatorial debate was between Tom Horner, the candidate endorsed by the Independence Party leadership, and Rob Hahn. However, the party has five candidates on its primary ballot for Governor. The others are Phil Ratte, John Uldrich, and Rahn Workcuff. It is very unusual for any minor party in the United States to have as many as five gubernatorial candidates on its primary ballot. Probably the only other minor party ballot with more than two choices for any office this year is the Arizona Libertarian Party primary ballot for Governor, which has four candidates listed: Ron Cavanaugh, Barry Hess, Bruce Olsen, and Alvin Yount. The Arizona Libertarian Party web page has this link for anyone interested in learning about each of those candidates.