A coalition of twenty Democratic attorneys general, including several from states without a prohibition on so-called assault weapons, are sounding off in support of California’s gun ban. In an amicus brief filed with the Ninth Circuit Court of Appeals in Miller v. Bonta, New Jersey Attorney General Matthew Platkin and Massachusetts AG Andrea Campbell and the attorneys general of Arizona, Colorado, Connecticut, Delaware, D.C., Hawaii, Illinois, Maine, Maryland, Michigan, Minnesota, Nevada, New York, Oregon, Pennsylvania, Rhode Island, Vermont, and Washington contend that California’s ban doesn’t violate the Second Amendment because the arms that are prohibited aren’t protected by the Constitution...