Colorado Governor John Hickenlooper

Colorado Governor John Hickenlooper

RJ Sangosti/The Denver Post via Getty Images

Colorado Governor John Hickenlooper signs gun control legislation in Denver. Jane Dougherty, center, who's sister, Mary Sherlach, was killed at Sandy Hook, holds her hands to her mouth as she and other supporters watch Hickenlooper sign the measures enacting stricter gun laws in Colorado.