On July 27, independent candidate Christopher Graveline, who is running for Michigan Attorney General, filed a federal lawsuit, challenging the Michigan petition requirement for statewide independents. Graveline v Johnson, e.d., 2:16cv-11844.
In the entire history of the state, only twice has any independent candidate managed to get on the ballot for statewide office using the current requirement, which requires 30,000 signatures by the middle of July. The two were Ross Perot in 1992, and Ralph Nader in 2004.
The primary in Michigan is in August. Generally non-presidential independent candidate petition deadlines are unconstitutional if they are earlier than the primary day, or the day before. The case is assigned to U.S. District Court Judge Victoria A. Roberts, a Clinton appointee. Here is the Complaint.