Parkland survivor David Hogg: 'We've changed America'

Gun safety advocate David Hogg, 18, told students at Nassau Community College on Wednesday that he is pressing forward, looking ahead to the 2020 presidential election when he and other members of a national group that he helped organize will have another chance to support candidates who back their calls for stricter national firearms controls. Hogg was a senior at Marjory Stoneman Douglas High School in Parkland, Florida, when a lone gunman killed 17 people and injured 17 others with a high-powered assault rifle on Valentine's Day. Credit: Howard Schnapp