No, a federal court can generally only get involved in a state matter if there is a federal issue, such as a federal due process or equal protection claim. The two District COurt judges ruled the state law unconstitutional based on the U.S. Constitution.
Let's hope that when the Dems wake up Justice Stevens, the justice who covers the 6th Circuit, that he hangs up the phone and goes back to sleep.
Sorry. Just learned that it was a 1983 claim (federal constitutional civil rights claim). You're right.