On May 23, U.S. District Court Judge Matthew F. Leitman, an Obama appointee, issued a 22-page order, putting Congressman John Conyers on the August 5 primary ballot. The decision rests almost entirely on Nader v Blackwell, a 2008 decision of the Sixth Circuit that struck down Ohio’s requirement that circulators for candidates must be registered voters. Michigan is also in the Sixth Circuit.
Michigan election officials had already determined that Conyers did have enough valid signatures, if it weren’t for the law barring circulators who aren’t registered voters. The opinion is somewhat critical of the state for initially saying it would not determine how many valid signatures Conyers had until early June. The decision says the court had to pressure the state to make its decision on that by today. Thanks to Rick Hasen for the link.