A week after Gov. Scott Walker signed a bill stripping public union workers of their collective-bargaining rights—prompting massive protests—a Wisconsin judge issued a temporary restraining order blocking the law from taking effect. The order was issued Friday by Dane County Judge Maryann Sumi, and was requested by that county’s District Attorney Ismael Ozanne, a Democrat. The order is a huge setback for Walker and the GOP, and puts the future of the law in doubt. Ozanne had filed a lawsuit alleging that a legislative committee that ended the weeks-long stalemate met without the 24-hour notice required by Wisconsin’s open-meetings law.