From Ballot Access News:

On July 28, the ballot-qualified Natural Law Party of Michigan nominated Emidio “Mimi” Soltysik for President, and Angela Walker for Vice-President. They are also the nominees of the Socialist Party.

In 2012, the Natural Law Party nominated Rocky Anderson, Justice Party presidential nominee. In 2008 it nominated Ralph Nader. In 2004 it nominated Walt Brown, that year’s Socialist Party presidential nominee. The Natural Law Party is the last surviving renmant of the Natural Law Party, which was active in elections 1992-2002. It remains on the ballot in Michigan because Michigan has a very easy vote test for a party to remain on.