Parkland shooting survivors on activism: "We’re what every American should be"
Since the shooting deaths of 17 people at Stoneman Douglas High School last month in Florida, survivors have mobilized the Never Again movement. Their goal is to overcome political obstacles in an effort to influence gun legislation. Among the most vocal students are seniors Emma Gonzalez and David Hogg. They join "CBS This Morning" to discuss the movement and why they expect changes to happen.