- Democratic senator from Massachusetts, 16 July 2013-present. Won a special election caused by the resignation of Senator John Kerry, who became Secretary of State. Massachusetts Governor Deval Patrick had originally appointed William Cowan to fill the seat until the special election could be held, and Cowan declined to run for election.
- U.S. Congressional representative from Massachusetts, 2 November 1976-15 July 2013. In 1976, won a special election to fill the vacancy caused by the death of representative Torbert H. Macdonald. In 2013, resigned to become a U.S. senator after he won a special election caused by the resignation of senator John Kerry.
- Member of the Massachusetts state house of representatives, 1973-1976.
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