Two parties, other than the Democratic and Republican Parties, are entitled to their own primary in Missouri. Filing has been open for a while, and closes March 27. So far, only six individuals have filed to run for federal and state office in the Libertarian primary, and only two in the Constitution Party primary.
Libertarians are running for Governor, Secretary of State, one U.S. House race, and three State House races. Constitution Party members are running for Lieutenant Governor and one U.S. House race.
Missouri does not permit write-ins in its August primary.