The Arkansas state legislature enacts a statute that prohibits the advertising of video games “because the games might be harmful to minors.” Despite this new statute, the president of Games Marketing, Inc. (GMI), orders GMI marketers to place ads in various media. When a GMI ad appears on HDTV, a local television station, GMI and HDTV are charged with violating the statute. What is the defendants’ best defense against a conviction?