In this second of a series of columns commenting on Republican efforts to challenge the apportionment of Illinois state legislative districts that the General Assembly and the Governor recently enacted, Illinois Law dean Vikram David Amar and professor Jason Mazzone argue that a federal court may not be able to grant the relief the plaintiffs are seeking. Dean Amar and Professor Mazzone point out that the Illinois Supreme Court is the proper arbiter of the key legal question whether a commission is required under state law.