United States Senate

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FILE- In this April 25, 2016 file photo, Rep. Alan Grayson, D-Fla. answers a question in a debate for the U.S. Senate in Orlando, Fla. Democratic leaders want Rep. Alan Grayson to go away. His ex-wife says he's abusive. Yet the liberal lawmaker is pressing ahead with his U.S. Senate bid, and could upend the party's hopes that moderate Rep. Patrick Murphy emerges as the nominee against Republican Sen. Marco Rubio. (AP Photo/John Raoux, File)

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El Paso County Commissioner Darryl Glenn gives two thumbs during the U.S. Senate Republican Primary, Tuesday, June 28, 2016 in Colorado Springs, Colo. Glenn has won Colorado's Republican U.S. Senate primary and will face incumbent Democrat Michael Bennet in November. (Stacie Scott/The Gazette via AP)

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In this May 31, 2016, photo, U.S. Senate candidate Catherine Cortez Masto applies a sticker to her jacket after voting at an early voting site in Las Vegas. A former state attorney general, Masto, would be the first Latina ever to serve in the U.S. Senate. (AP Photo/John Locher)

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FILE- In this April 25, 2016 file photo, Republican Ron Unz, a candidate for the U.S. Senate, talks with reporters after facing four challengers in a U.S. Senate debate at the University of the Pacific in Stockton, Calif. (AP Photo/Rich Pedroncelli, File)

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Sen. Ron Johnson, Wisconsin Republican, said he believes that the American people should have a voice in shaping the Supreme Court "by their votes for the president and the majority party in the U.S. Senate" in November's election.

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Illustration on courtesy, respect and rules in the U.S. Senate by Linas Garsys/The Washington Times

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Sen. Lindsey Graham will take a break from the campaign trail Thursday and to the U.S. Capitol to formally introduce the Pain-Capable Unborn Child Protection Act before the U.S. Senate. (Associated press)

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Sen. Cory Gardner, R-Colo., speaks to members of the media following a U.S. Senate delegation tour of the over-budget Veterans Administration hospital complex, which is under construction, in Aurora, Colo. (AP Photo/Brennan Linsley)

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President Barack Obama speaks at the dedication of the Edward M. Kennedy Institute for the United States Senate in Boston, Monday, March 30, 2015. The $79 million Edward M. Kennedy Institute for the United States Senate dedication is a politically star-studded event attended by President Barack Obama, Vice President Joe Biden and past and present senators of both parties. It sits next to the presidential library of Kennedy’s brother, John F. Kennedy. (AP Photo/Susan Walsh)

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President Barack Obama speaks at the dedication of the Edward M. Kennedy Institute for the United States Senate, Monday, March 30, 2015, in Boston. The $79 million Edward M. Kennedy Institute for the United States Senate dedication is a politically star-studded event attended by President Barack Obama, Vice President Joe Biden and past and present senators of both parties. It sits next to the presidential library of Kennedy’s brother, John F. Kennedy. (AP Photo/Susan Walsh)

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A pollster finds that 46 percent of Republicans want their candidates to be more conservative, like Sen. Ted Cruz, Texas Republican and one of the most conservative members of the U.S. Senate. (Associated Press)

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US Senate Majority Leader Mitch McConnell, Republican of Kentucky, waits for the start of the State of The Union address by US President Barack Obama on January 20, 2015 in the House Chamber of the US Capitol in Washington, DC. AFP PHOTO/POOL/MANDEL NGAN

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National Republican Senatorial Committee is hosting a serious fundraiser for Rep. Bill Cassidy and his fight to best Sen. Mary Landrieu in the U.S. Senate runoff in Louisiana on Saturday. (Associated Press)

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Republican U.S. Senate candidate Dan Sullivan walks to the stage to greet supporters on Election Night, Tuesday, Nov. 4, 2014, in Anchorage Alaska. (AP Photo/Ted S. Warren)

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Republican candidate Cory Gardner ousts incumbent Democratic Sen. Mark Udall to win the U.S. Senate seat in Colorado.

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Democratic U.S. Senate candidate Alison Lundergan Grimes votes Tuesday Nov. 4, 2014, at the The Peasant Green Baptist Church in Lexington, Ky. (AP Photo/ John Flavell)

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Mike McFadden, left, and incumbent Sen. Al Franken, D-Minn., meet at the Fitzgerald Theater in St. Paul, Minn. on Sunday, Nov. 2, 2014, in their final debate before the election for the U.S. Senate seat. (AP Photo/Minnesota Public Radio, Bridget Bennett)

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Former Republican presidential nominee Mitt Romney appeared in a new campaign ad for U.S. Senate candidate Scott Brown, telling New Hampshire voters that a vote for Democratic Sen. Jeanne Shaheen is a vote for President Obama. (YouTube)

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Dr. Ben Carson, right, speaks at a Nov. 1, 2014 campaign rally in Abita Springs, La. for U.S. Senate candidate Rep. Bill Cassidy, R-La. (AP Photo/Scott Threlkeld)