Claire Mccaskill

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Sens. Claire McCaskill, Missouri Democrat (left), and Kelly Ayotte, New Hampshire Republican, speak at a Washington news conferemce Thursday. (Associated Press)

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Philomena Lee, center, an Irish woman whose search for the son that she gave up for adoption in the 1950’s, and is now a Hollywood film, meets with Sen. Claire McCaskill, D-Mo., right, on Capitol Hill in Washington, Thursday, Jan. 30, 2014. With her life story now the subject of an Oscar-nominated film, Philomena Lee is calling for government reforms in Ireland that would grant adopted people access to their adoption files. At far left is Mari Steed, with the Adoption Rights Alliance. (AP Photo)

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Philomena Lee, center, an Irish woman whose search for the son that she gave up for adoption in the 1950’s, and is now a Hollywood film, meets with Sen. Claire McCaskill, D-Mo., left, on Capitol Hill in Washington, Thursday, Jan. 30, 2014. With her life story now the subject of an Oscar-nominated film, Philomena Lee is calling for government reforms in Ireland that would grant adopted people access to adoption files. Her daughter, Jane Libberton, follows at rear. (AP Photo)

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** FILE ** In this May 7, 2013, file photo, Sen. Claire McCaskill, D-Mo. speaks on Capitol Hill in Washington. (AP Photo/J. Scott Applewhite, File)

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Sen. Ron Johnson, Wisconsin Republican, and Sen. Claire McCaskill, Missouri Democrat, says it's time Charles Edwards resign as inspector general for the Department of Homeland Security because of inappropriate behavior, including his actions regarding an investigation of Secret Service agents. (ASSOCIATED PRESS PHOTOGRAPHS)

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Rep. Todd Akin, Missouri Republican and U.S. Senate candidate, is backed by family members as he concedes to Democratic incumbent Claire McCaskill on Nov. 6, 2012, in Chesterfield, Mo. (Associated Press)

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Gail Bowman of St. Louis reacts Nov. 6, 2012, after hearing that Todd Akin, Republican candidate for U.S. Senate in Missouri, lost to Democratic incumbent Claire McCaskill during Akin's watch party in Chesterfield, Mo. (Associated Press)

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Sen. Claire McCaskill, D-Mo., smiles as she stands next to her husband, Joseph Shepard, while declaring victory over challenger Rep. Todd Akin, R-Mo., in the Missouri Senate race Tuesday, Nov. 6, 2012, in St. Louis. (AP Photo/Jeff Roberson)

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**FILE** Claire McCaskill (left), gives the thumbs up to supporters as she holds the hand of her mother, Betty Anne McCaskill, after participating in a debate for U.S. Senate candidates against incumbent Sen. Jim Talent at Clayton High School in Clayton, Mo., on Oct. 11, 2006. (Associated Press)

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** FILE ** Republican Rep. Todd Akin speaks as he takes on Democratic Sen. Claire McCaskill during the second debate in the Missouri Senate race Thursday, Oct. 18, 2012, in Clayton, Mo. (AP Photo/Emily Rasinski)