Pat Gibson holds a drawing of Meadow Pollack, a victim of the Marjory Stoneman Douglas High School shooting, as she stands outside of the school as part of a nationwide protest against gun violence, Wednesday, March 14, 2018, in Parkland, Fla. Organizers say nearly 3,000 walkouts are set in the biggest demonstration yet of the student activism that has emerged following the massacre of 17 people at Marjory Stoneman Douglas High School in February. (AP Photo/Lynne Sladky)
Pat Gibson holds a drawing of Meadow Pollack, a victim of the Marjory Stoneman Douglas High School shooting, as she stands outside of the school as part of a nationwide protest against gun violence, Wednesday, March 14, 2018, in Parkland, Fla. Organizers say nearly 3,000 walkouts are set in the biggest demonstration yet of the student activism that has emerged following the massacre of 17 people at Marjory Stoneman Douglas High School in February. (AP Photo/Lynne Sladky)