As students across the country prepare to stage a national protest calling for gun control reform in the wake of school shootings, Parkland, Florida survivor David Hogg, 17, has declared this is the 'start of a revolution.' Hogg talked to Good Morning America on Saturday morning about his goals for participating in the 'March For Our Lives' demonstration at its primary event in Washington, DC. 'Today we are going to start a revolution. This is the beginning of a lifelong marathon not only for me but for my generation,' Hogg told GMA. 'We are sick and tired of the inaction...