Sen. William "Mo" Cowan, D-Mass., right, shakes hands with Secretary of State John Kerry in the Old Senate Chamber on Capitol Hill in Washington, Thursday, Feb. 7, 2013, following a re-enactment of his swearing-in as a Senator. From left are, Kerry, Sen. Elizabeth Warren, D-Mass., Cowan's mother Cynthia Cowan and his son Miles, 4. (AP Photo/Kevin Wolf)
