Kay R. Hagan

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The campaign between Republican Senate candidate Thom Tillis (center) and incumbent Sen. Kay R. Hagan has cost $111 million. (AP Photo/Chuck Burton)

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benefactor: With President Obama all but unwelcome, former Secretary of State Hillary Clinton and former President Bill Clinton have stumped for midterm Democratic candidates, including Sen. Kay R. Hagan (right) of North Carolina. (Associated Press)

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Sen. Kay Hagan, North Carolina Democrat, and Republican Thom Tillis, speaker of the state House, remain locked in a neck-and-neck race heading into the final week of the 2014 campaign. A Civitas poll last week showed them tied at 44 percent. (Associated Press)

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Sen. Kay Hagan, D-N.C., makes a comment during a live televised debate with North Carolina Republican Senate candidate Thom Tillis at UNC-TV studios in Research Triangle Park, N.C., Tuesday, Oct. 7, 2014. (AP Photo/Gerry Broome, Pool)

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Sen. Kay Hagan, North Carolina Democrat, has been polling strong and energizing her base while Republican candidate for Senate Thom Tillis is struggling to gain the support of more conservative members of the GOP. (Associated Press)

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Sen. Kay Hagan, D-N.C. makes a statement during a debate with Republican candidate for Senate Thom Tillis at UNC-TV studios in Research Triangle Park, N.C., in this Sept. 3, 2014, file photo. (AP Photo/Gerry Broome, File)

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Sen. Kay Hagan, North Carolina Democrat, has borne the brunt of attacks from challenger Thom Tillis, who accuses her of absenteeism from Senate Armed Services Committee meeting. Mrs. Hagan, in turn, has alleged Mr. Tillis is "waffling" about how he'd confront the Islamic State threat. (Associated Press)

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Sen. Kay Hagan, D-N.C. makes a statement during a live televised debate with Republican candidate for Senate Thom Tillis at UNC-TV studios in Research Triangle Park, N.C., Wednesday, Sept. 3, 2014. (AP Photo/Gerry Broome, Pool)

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Sen. Kay Hagan, D-N.C. makes a statement during a live televised debate with Republican candidate for Senate Thom Tillis at UNC-TV studios in Research Triangle Park, N.C., Wednesday, Sept. 3, 2014. (AP Photo/Gerry Broome, Pool)

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Republican candidate for Senate Thom Tillis (right) and Concerned Veterans for America been airing attack ads targeting incumbent Democratic Sen. Kay Hagan for the conditions of VA facilities in North Carolina, but analysts say the issue will have little impact on the race. (Associated press)

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Democratic incumbent Sen. Kay Hagan will be watching closely the challenge to North Carolina's voter ID law. Opponents of the law contend that the identification requirement creates an obstacle for blacks, Hispanics and women to reach the ballot box. (Associated Press)

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In this Wednesday, April 16, 2014 photo, Sen. Kay Hagan, D-N.C., listens during an appearance in Durham, N.C. Hagan has tried for her first 5 1/2 years in the U.S. Senate to persuade North Carolina voters that being in the middle of the road is a good thing. Hagan released her first commercial in her bid to win re-election, a statewide radio spot criticizing Tillis, even though he's just one of eight candidates in the May 6 GOP primary. (AP Photo/Gerry Broome)

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FILE - In this April 23, 2014, file photo, Republican senatorial candidate Thom Tillis responds during a televised debate at WRAL television studios in Raleigh, N.C. The struggle for control of the Republican Party is getting an early voter test in North Carolina, where former presidential nominee Mitt Romney and tea party favorite Rand Paul on Monday, May 5 pushed their own candidates for the right to challenge Democratic Sen. Kay Hagan in November.(AP Photo/Gerry Broome, Pool)

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Sen. Kay Hagan, a Democrat, is trying to stave off GOP challengers in North Carolina, where enrollment in Obamacare exceeded Avalere's projection by more than 50 percent. (Associated Press Photographs)

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FILE - This April 16, 2014 file photo shows Sen. Kay Hagan, D-N.C. in Durham, N.C. Deciding which party controls the U.S. Senate for the final two years of President Barack Obama’s tenure could come down to women _ both the handful who are running in significant races and the moderate female voters who often tip close elections. (AP Photo/Gerry Broome, File)