Minnesota has four ballot-qualified parties: the two major parties, the Legal Marijuana Now Party, and the Grassroots-Legalize Cannabis Party. Minnesota has eight U.S. House seats. In six districts, one or the other of the marijuana parties had a nominee. Treating the two parties as a single party, their nominees polled 6.86% of the vote in the districts in which they had candidates.
This is easily the best showing by any party, other than the Democratic and Republican Parties, in U.S. House races around the country. All of the Minnesota districts had a Republican and a Democratic running as well. There were U.S. House districts around the nation in which a Libertarian Party nominee polled above 15%, but those were all districts with only one major party nominee.
Minnesota did not have any independent candidates on the ballot for U.S. House, nor any minor party nominees for U.S. House other than from the two marijuana parties. Minnesota has very stringent ballot access for office other than president. Also Minnesota doesn’t have the initiative process, so marijuana legalization advocates can’t work toward their goal using the initiative process.