Kelly Ayotte

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An amendment introduced by Sen. Kelly Ayotte, New Hampshire Republican, to preserve tight restrictions on Guantanamo detainees was defeated by a vote of 55 to 43 in the Senate. (ASSOCIATED PRESS)

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Sen. Kelly Ayotte, New Hampshire Republican, walks to a meeting with Senate Minority Leader Sen. Mitch McConnell, Kentucky Republican, on Capitol Hill in Washington on Monday, Oct. 14, 2013. (AP Photo/Evan Vucci)

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**FILE** Senate Armed Services Committee member Kelly Ayotte, New Hampshire Republican (Associated Press)

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Gun control advocates have funded an ad campaign that criticizes Sen. Kelly Ayotte's vote on a gun control measure. She is facing re-election in 2016. (Associated Press)