Madison Warner, the daughter of U.S. Sen. Mark Warner, D-Va., died following a "decades-long battle with juvenile diabetes and other health issues," the lawmaker's office said Monday. She was 36. "We are heartbroken beyond words by the passing of our beloved daughter ... after a decades-long battle with juvenile diabetes and other health issues," according to a statemen t by the senior senator from Virginia and his wife, Lisa Collins. "She filled our lives with love and laughter, and her