Scott P. Brown

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** FILE ** In this Nov. 13, 2012, file photo, Sen. Scott Brown, R-Mass., speaks during a media availability, on Capitol Hill in Washington. Brown, who was defeated in his re-election bid, said Friday, Feb. 1, 2013, that he will not run for the Senate seat vacated by John Kerry, who was named secretary of state. (AP Photo/Alex Brandon, File)

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Sen. Scott P. Brown leaves town quietly after losing his re-election bid last month in Massachusetts. He delivered a farewell address to the Senate on Wednesday. (Associated Press)

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Former U.S. Sen. Scott Brown (left), Massachusetts Republican, hugs his wife, Gail Huff, at the conclusion of his concession speech Nov. 6, 2012, at an Election Night watch party in a hotel in Boston. Brown lost to Democratic challenger Elizabeth Warren in his bid for re-election. (Associated Press)

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Democrat Elizabeth Warren, center, waves to the crowd with her husband Bruce Mann, left, during an election night rally at the Fairmont Copley Plaza hotel in Boston after Warren defeated incumbent GOP Sen. Scott Brown in the Massachusetts Senate race, Tuesday, Nov. 6, 2012. (AP Photo/Michael Dwyer)

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U.S. Sen. Scott Brown, R-Mass., center, waves to the crowd at the conclusion of a concession speech as his daughter Ayla Brown, left, applauds and wife Gail Huff, right, waves at an election night watch party in a hotel in Boston, Tuesday, Nov. 6, 2012. Brown lost to Democratic challenger Elizabeth Warren in his bid for re-election to the U.S. Senate. (AP Photo/Steven Senne)