Mark Warner

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Sen. Mark Warner, Virginia Democrat, backs CIA nominee Gina Haspel. Mr. Warner is the ranking Democrat on the Senate Select Committee on Intelligence and he said he would support her despite doubts among some lawmakers about Ms. Haspel's record. (Associated Press)

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Sen. Mark Warner, Virginia Democrat, remains locked in a dead heat with Republican Ed Gillespie a full day after the polls closed. (Associated Press)

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Incumbent Democratic Sen. Mark Warner (right) holds a lead over Republican challenger Ed Gillespie. (Associated Press)

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Sen. Mark Warner sided with President Obama 100 percent of the time, according to a review of voting records this year. The rankings, though, were based on a fraction of roll call votes. (Associated Press)

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The candidates shake hands before the Fairfax County Chamber of Commerce hosts Virginia's U.S. Senate Debate between Democratic U.S. Sen. Mark Warner, right, and Republican challenger Ed Gillespie on Tuesday, Oct. 7, 2014 in McLean, Va. (AP Photo/The Washington Post, Bill O'Leary, Pool)

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Democratic Sen. Mark Warner and his Republican challenger, Ed Gillespie, agreed on foreign policy and other issues but showed stark differences elsewhere. (Associated Press)

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Sen. Mark Warner, D-Va. speaks during a town hall forum in Reston, Va, Monday, Sept 8. 2014. Warner and his Republican opponent Ed Gillespie made their pitches to northern Virginia's tech community at the town hall forum. The Northern Virginia Technology Council hosted the town hall forum. (AP Photo/Luis M. Alvarez)

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Republican Ed Gillespie, left, and Sen. Mark Warner, right. (Associated Press) ** FILE **

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Sen. Mark Warner, Virginia Democrat, promised to study the new environmental rules putting coal-fired power plants on the road to extinction and listen to stakeholders. (associated press)

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U.S. Senator Mark Warner talks to people at Matchbox Reality during the start of his re-election campaign Friday, May 30, 2014, in Harrisonburg, Va. Warner is a former governor who is seeking a second term in the Senate. (AP Photo/The Daily News-Record, Nikki Fox)