United States Senate

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Tony Teano (left) of the Anne Arundel Community College internship office talks with independent U.S. Senate candidate Rob Sobhani at a jobs fair at the college, in Arnold, Md., on Wednesday, Oct. 17, 2012. (Andrew Harnik/The Washington Times)

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Rob Sobhani (center), an independent candidate for U.S. Senate from Maryland, talks with Brian Phipps (right) of Arnold, Md., along the downtown harbor in Annapolis on Wednesday, Oct. 17, 2012. (Andrew Harnik/The Washington Times)

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Candidates for Indiana's U.S. Senate seat Democrat Joe Donnelly (left), Libertarian Andrew Horning (center) and Republican Richard Mourdock participate in a debate in New Albany, Ind., on Oct. 23, 2012. (Associated Press)

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** FILE ** The candidates for Indiana's U.S. Senate seat — (from left) Democratic Rep. Joe Donnelly, Libertarian Andrew Horning and Republican state Treasurer Richard Mourdock — debate in New Albany, Ind., on Tuesday, Oct. 23, 2012. (AP Photo/Michael Conroy)

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Democratic candidate for Wisconsin's U.S. Senate seat, U.S. Rep. Tammy Baldwin, participates in a debate against Republican candidate former Gov. Tommy Thompson held at the Wisconsin Institute for Public Policy and Service on the University of Wisconsin Marathon County campus in Wausau, Wis., Thursday, Oct. 18, 2012. (AP Photo/Milwaukee Journal Sentinel, Gary Porter, Pool)

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** FILE ** Democratic candidate for the U.S. Senate seat from Virginia, former Gov. Tim Kaine, left, listens as Republican candidate, former Sen. George Allen, right, speaks during a debate at Virginia Tech in Blacksburg, Va., Thursday, Oct. 18, 2012. (AP Photo/Steve Helber)

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A spokesman for the U.S. Senate campaign of Nebraska state Sen. Deb Fischer said on Monday that with Mr. Kerrey’s new campaign attack ad, he is now “revealing the disturbing depths he’ll stoop to in order to win” his race against her. (Associated Press)

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**FILE** A volunteer works to prevent campaign signs supporting the U.S. Senate candidacy of North Dakota Republican U.S. Rep. Rick Berg from blowing away in the wind on March 30, 2012, outside the Bismarck Civic Center in Bismarck, N.D., where North Dakota Republicans are holding their state convention this weekend. (Associated Press)

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**FILE** Heidi Heitkamp, the North Dakota Democratic candidate for the U.S. Senate, speaks Aug. 11, 2012, during the opening of a North Dakota Democratic campaign office in Dickinson, N.D. At right is Ryan Taylor (with hat), the North Dakota Democratic candidate for governor, and Ryan Nagle, a Democratic campaign staffer. (Associated Press)