Today’s 7th U.S. Circuit Court of Appeals case addresses the doctrine of claim preclusion, which holds a judgment on the merits bars any subsequent action between the parties for the same cause of action on all matters actually decided and all matters which could have been decided.Walczak v. Chicago Board of Education, 739 F.3d 1013 (7th Cir. 2014) presents the question of whether a teacher who was fired and filed suit in state court for judicial review was obliged to also bring her age discrimination (ADEA) later …