5. According to the OP article, it's already at the Supreme Court
... something about an identical case originating in Texas. If it's identical, then the TX ruling should apply to this MI case.
According to some talk on NPR this morning, the 6th Circuit split along party lines: 8 judges appointed by Democrats voted to overturn the MI amendment, 7 appointed by Republicans voted to uphold the amendment. 2 judges (Republican appointees) recused, because of connections to MI universities, if I heard right.