In this Dec. 3, 2019, photo, Mark Barden and his daughter Natalie Barden hold a photograph of Natalie's late brother, Daniel, at their home in Newtown, Conn. Daniel died in the Dec. 14, 2012, Sandy Hook Elementary School shooting that killed 20 first-graders and six educators. Natalie, 17, is among Newtown students who have grown up to become young voices in the gun violence prevention movement. (AP Photo/Dave Collins)
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