 The law is championed by gun safety groups because it creates a cooling-off period for people who might purchase a gun during a moment of crisis. Activists have also noted that other states with waiting periods continue to have gun shows. Still, the law has angered gun rights groups that have vowed to hold the lawmakers who voted for it accountable in this fall's legislative elections. The lawsuit has not yet been filed, but Laura Whitcomb of the Gun Owners of Maine said she's confident that it will be successful.