Article continues below advertisementAnderson Cooper got choked up as he spoke about the "sadness" felt by families of kids lost to gun violence on last night's 60 Minutes.The CNN anchor, 58, showed his emotional side during an interview with CBS News correspondent Steve Hartman during the Sunday, November 23 episode while discussing the upcoming Netflix documentary All the Empty Rooms.The film follows Hartman and photographed Lou Bopp as they visit the preserved bedrooms of children killed in school shootings across the U.S.