Marjory Stoneman Douglas High School sophomore Gabe Glassman speaks at a rally at Alexander W. Dreyfoos School of the Arts in Palm Beach, Fla. The 15-year-old survived the school shooting that left 17 dead.

Marjory Stoneman Douglas High School sophomore Gabe Glassman speaks at a rally at Alexander W. Dreyfoos School of the Arts in Palm Beach, Fla. The 15-year-old survived the school shooting that left 17 dead.