Fresh off an evening flight from New York City where he appeared on several news shows, David Hogg darts into his house in Parkland, grabs a box of chocolates - a gift for a friend - and hops into his Honda Accord. Within minutes, Marjory Stoneman Douglas High School comes into view in the distance. It's two weeks after the mass shooting that launched the student-led #NeverAgain movement for gun control. David, a spokesman for the group, has become a familiar face to TV viewers.