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U.S. Senate Minority Leader Mitch McConnell (R-KY) waves to supporters with his wife, former United States Secretary of Labor Elaine Chao, at his midterm election night rally in Louisville, Kentucky, Nov. 4, 2014.

Sen. Jeff Sessions, R-Ala. leaves a polling place after voting at Hillcrest Baptist Church in Mobile, Alabama., Nov. 4, 2014.

Republican U.S. Senate candidate Dan Sullivan walks to the stage to greet supporters on election night, Nov. 4, 2014, in Anchorage Alaska.

Rep. Tom Cotton, R-Ark. hugs his wife Anna at the his election watch party in North Little Rock, Ark., Nov. 4, 2014. Cotton defeated incumbent Sen. Mark Pryor in the Tuesday election.

Senator-elect Cory Gardner, a Colorado congressman, delivers his victory speech in Denver Nov. 4, 2014.

Sen. Chris Coons D-Del., accompanied by his wife Annie, left, and family, speaks to supporters after winning his re-election bid for the Senate, Tuesday, Nov. 4, 2014, during election night party in Newark, Del.

Georgia Republican U.S. Senate candidate David Perdue celebrates with outgoing U.S. Sen. Saxby Chambliss, R-Ga., left, and wife Bonnie, right, at his election night party, Tuesday, Nov. 4, 2014, in Atlanta.

Sen. Jim Risch, R-Idaho speaks after winning another term during the Idaho GOP election night event at the Riverside Hotel in Boise, Idaho, Nov. 4, 2014.

Supporters cheer before Kansas Sen. Pat Roberts makes his victory speech during a Republican watch part, Nov. 4, 2014, in Topeka.

Incumbent U.S. Sen. Susan Collins, R-Maine, celebrates with husband Thomas Daffron, right, her re-election victory over Democrat Shenna Bellows Tuesday, Nov. 4, 2014, in Portland, Maine.

U.S. Sen. Ed Markey, D-Mass., and his wife Dr. Susan Blumenthal celebrate his re-election over Republican Brian Herr, Nov. 4, 2014 in Boston.

U.S. Senate elect Gary Peters stands with his wife Colleen, center, with retiring Sen. Carl Levin, Levin's wife Barbara Halpern-Levin, and Sen. Debbie Stabenow, right, after Gary Peters addressed supporters in Detroit, Tuesday, Nov. 4, 2014. Peters defeat

Sen. Al Franken, D-Minn., accompanied by his wife, Franni, left, and other relatives, addresses Democratic party night supporters after winning his Senate race against Republican Mike McFadden, Tuesday, Nov. 4, 2014, in Minneapolis.

Sen. Thad Cochran, R-Miss., salutes his supporters following his victory over Democrat Travis Childers and Reform Party candidate Shawn O'Hara, Tuesday, Nov. 4, 2014, at his victory party in Jackson, Miss.

Montana Sen.-elect Steve Daines in Bozeman, Mont., Nov. 4, 2014.

Republican Senator-elect Ben Sasse addresses supporters in Lincoln, Neb., Nov. 4, 2014, after winning the vote for the Nebraska senate seat of retiring Sen. Mike Johanns, R-Neb. Sasse was running against Democrat Dave Domina.

Sen. Jeanne Shaheen, D-N.H. celebrates with supporters after winning the election for a second term in the Senate, Tuesday, Nov. 4, 2014, in Manchester, N.H. Shaheen beat Republican Scott Brown.

Sen. Cory Booker, D-N.J., addresses supporters during an election night victory gathering, Nov. 4, 2014, in Newark, N.J.

Sen. Tom Udall, D-N.M., waives to supporters with his wife, Jill Cooper Udall, right, at the Double Tree hotel after being re-elected as one of New Mexico's Senators, Nov. 4, 2014 in Albuquerque.

Republican Thom Tillis (L), and wife Susan react after the results of the U.S. midterm elections early morning in Charlotte, North Carolina, Nov. 5, 2014.

Sen. Jim Inhofe, R-Okla. gives a victory speech at the Republican watch party in Oklahoma City, Nov. 4, 2014.

Sen. Jeff Merkley, D-Ore., center, with from left, son Jonathan Merkely, wife Mary and daughter Brynne Merkely and Sen Ron Wyden, D-Ore., greets supporters at the Democratic election night party in Portland Ore., Nov., 4, 2014.

Sen. Lindsey Graham, R-S.C. speaks to supporters after being re-elected, Nov. 4, 2014, in Columbia, S.C.

Republican Mike Rounds celebrates with supporters after winning South Dakota Senate race at an election night party in Sioux Falls, Nov. 4, 2014.

Sen. Lamar Alexander, R-Tenn. waves after speaking to supporters, Nov. 4, 2014, in Knoxville, Tenn.

U.S. Sen. John Cornyn, R-Texas, delivers his victory speech after winning re-election to the U.S. Senate Nov. 4, 2014, in Austin.

West Virginia Republican Senate candidate Rep. Shelley Moore Capito applauds and sings "I Gotta Feeling" by The Black Eyed Peas after winning the Senate seat, Nov. 4, 2014, at Embassy Suites in Charleston W.Va.

British national newspapers' front pages leading with the story about the death of U.S. musician Prince are displayed, April 22, 2016.

Democratic U.S. Sen. Dick Durbin delivers his victory speech at his election night event on Nov. 4, 2014, in Chicago. Durbin declared victory over challenger Republican State Sen. Jim Oberweis.