The Pennsylvania Supreme Court is hearing oral arguments today that may lead to a chance at parole for more than 400 inmates convicted of murder as minors. The Court is deciding if a June 2012 U.S. Supreme Court decision is retroactive, and if so, what sentence should be given to two convicts in today’s cases. The federal court, in Miller v. Alabama, said that minors convicted of murder have a right to present mitigating factors — such as the immaturity of youth — to sentencing judges. That invalidates one-size-fits-all mandatory life without parole sentences listed in federal and 28 states’ statutes. “It’s about retroactivity and also resentencing,” said Marsha Levick, deputy director of the Juvenile Law Center in Pennsylvania, who is arguing for retroactivity before the court.