Biden Swears In New MA Senator William Cowan

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U.S. Sen. William 'Mo' Cowan is sworn in by U.S. Vice President... News PhotoAdult,Capitol Building - Washington DC,Elizabeth Warren,Former,Government,Horizontal,John Kerry,Joseph Biden,Males,Oath,Politics,Reenactment,Secretary Of State,Son,USA,Vice President,Waist Up,Washington DC,Wife,WomenPhotographer Collection: Getty Images News 2013 Getty ImagesWASHINGTON, DC - FEBRUARY 07: U.S. Sen. William 'Mo' Cowan (D-MA) (3rd L) is sworn in by U.S. Vice President Joseph Biden (R) during a re-enactment of the swearing-in as Cowan's wife Stacy (6th L), sons Miles (4th L) and Grant (5th L), U.S. Sen. Elizabeth Warren (D-MA) (2nd L), and Secretary of State and former U.S. Sen. John Kerry (D-MA) (L) look on February 7, 2013 at the Old Senate Chamber of the U.S. Capitol in Washington, DC. Cowan was appointed by Massachusetts Governor Deval Patrick as interim U.S. Senator to fill the seat that left vacant by Secretary of State and former U.S. Sen. John Kerry. (Photo by Alex Wong/Getty Images)