D.C. thumbs its nose at the Supreme Court and Second Amendment.
The Constitution is the supreme law of the land. The U.S. Supreme Court has the final say on the meaning of the Constitution. All public officials take an oath to support and defend the Constitution. Chicago thumbed it's nose at the U.S. Supreme Court's 2nd Amendment decision in McDonald. D.C has done likewise with regard to Heller with it's new gun control scheme.