Chris Murphy’s life changed forever on December 14, 2012, when a gunman murdered 20 first-graders and six educators at Sandy Hook Elementary School. He arrived at the firehouse where families waited for news that would never come, and made a promise: their children’s deaths would not be forgotten.

Murphy has become the Senate’s most passionate voice for gun safety, staging a 15-hour filibuster that forced a vote and helped pass the first federal gun safety legislation in three decades. But he’s never been a single-issue senator; he’s fought to expand healthcare access, support Connecticut’s defense industry workers, and rebuild American foreign policy around human rights.