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After a deranged shooter killed her husband and wounded her son on a Long Island commuter train in 1993, she went to Congress on a mission to curb gun violence.

Carolyn McCarthy in 1996 on her way to a news conference after the House of Representatives voted to repeal the ban on assault weapons. Not long afterward, she formally announced that she would run for Congress. (The gun control advocate Jim Brady was to her left.)Credit...David Scull/The New York Times