On June 2, the Initiative and Referendum Institute filed its opening brief in the U.S. Court of Appeals in D.C., in its case against the postal regulation that bars petitioning on all interior post office sidewalks. This case was filed in 2000. The opening parts of the brief explain why the case is taking so long. The brief highlights the fact that the evidence already submitted overwhelming shows that post office sidewalks have been traditionally used for First Amendment activity.