Let's step back a second and take a look at where Wisconsin's voter ID law is. On September 12, a three-judge panel of the Seventh Circuit heard oral arguments on the validity of Wisconsin's voter ID law. Almost immediately afterward, the panel stayed the district court's injunction, allowing Wisconsin to enforce the law. Several groups requested a rehearing on the stay, which the court denied, along with a sua sponte request by one of the Seventh Circuit judges to rehear the motion en banc. On October 6, the panel issued its opinion finding the law constitutional.
Then on October 9, the U.S. Supreme Court issued a short order -- with a dissent from Justices Alito, Scalia, and Thomas -- vacating the September 12 order, preventing Wisconsin from enforcing the law for this election. A day later, the Seventh Circuit denied Judge Richard Posner's sua sponte request to rehear the case en banc.