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'Mo' Cowan sworn in as Massachusetts' new senator

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WASHINGTON (AP) — William "Mo" Cowan of Massachusetts on Thursday became the Senate's newest member, but his tenure will be brief. The 43-year-old Democrat took his seat after a swearing-in ceremony led by Vice President Joe Biden. Cowan succeeds Democrat John Kerry, who just took over as secretary of state. Cowan was picked by Democratic Gov. Deval Patrick to serve as interim senator...