Appellate court upholds Chicago gun ban

Here is an excellent article discussing the recent appellate court case. Pay particular attention to the last paragraph which reads,

This seems to be specious legal reasoning to me. The Constitution specifically states that any matters not covered by it were to be left to the states. That obviously does not include the Second Amendment. If the Constitution is indeed the law of the land, it would seem to me that it would supersede state and municipal laws. Based on the judge's way of thinking, Los Angeles or Detroit could legalize slavery or coin their own money without running afoul of the feds.