In mid-April, Kansas passed a law asserting that federal gun regulations do not apply to guns made and owned in Kansas. Under the law, Kansans could manufacture and sell semi-automatic weapons in-state without a federal license or any federal oversight.
Kansas' "Second Amendment Protection Act" backs up its states' rights claims with a penalty aimed at federal agents: when dealing with "Made in Kansas" guns, any attempt to enforce federal law is now a felony. Bills similar to Kansas' law have been introduced in at least 37 other states. An even broader bill is on the desk of Alaska Gov. Sean Parnell. That bill would exempt any gun owned by an Alaskan from federal regulation. In Missouri, a bill declaring federal gun laws "null and void" passed by an overwhelming majority in the state house, and is headed for debate in the senate.
Mobilizing the pre-Civil-War doctrine of "nullification," these bills assert that Congress has overstepped its ability to regulate guns — and that states, not the Supreme Court, have the ultimate authority to decide whether a law is constitutional or not.