Tim Kaine (left) and Mike Pence take questions from moderator Elaine Quijano during the vice presidential debate at Longwood University in Farmville, Va., on Tuesday. Paul J. Richards/AFP/Getty Images hide caption

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Paul J. Richards/AFP/Getty Images

Gov. Mike Pence, R-Ind., and Sen. Tim Kaine, D-Va., will face off Tuesday evening during this campaign's only vice presidential debate, at Longwood University in Farmville, Va. Mandel Ngan/AFP/Getty Images hide caption

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Mandel Ngan/AFP/Getty Images

L: Republican vice presidential nominee Mike Pence speaks at a campaign rally Aug. 31 in Phoenix. R: Democratic vice presidential nominee Tim Kaine speaks at a campaign event Aug. 1 in Richmond, Va. L: Ralph Freso R: Alex Wong/Getty Images hide caption

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L: Ralph Freso R: Alex Wong/Getty Images

Virginia Sen. Tim Kaine counted health care policy among his chief concerns at a campaign rally for Hillary Clinton in Miami on July 23. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images

Democratic vice presidential nominee Tim Kaine does a walk on the Democratic National Convention stage ahead of his prime time speech on Wednesday night. Jessica Kourkounis/Getty Images hide caption

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Jessica Kourkounis/Getty Images

How Tim Kaine Went From City Council To Vice Presidential Candidate

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Sen. Tim Kaine spoke Spanish at a rally earlier this month in Miami, where he was announced as Hillary Clinton's vice presidential running mate. Gustavo Caballero/Getty Images hide caption

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Gustavo Caballero/Getty Images

In Divided Virginia Administration, Kaine Learned To Work Across The Aisle

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Tim Kaine's Pastor Describes The Veep Pick's Life As A Devout Catholic

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Democratic vice presidential nominee Tim Kaine looks on during a campaign rally with democratic presidential nominee Hillary Clinton on July 30 in Pittsburgh. Justin Sullivan/Getty Images hide caption

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Democratic presidential candidate Hillary Clinton and Sen. Tim Kaine of Virginia greet the crowd during a campaign event on July 14 in Annandale, Va. Alex Wong/Getty Images hide caption

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Alex Wong/Getty Images

Ever since New Jersey Gov. Chris Christie endorsed Trump (and stood behind him at a Super Tuesday event), he has been on many people's lists of likely Trump running mates. Bloomberg/Bloomberg via Getty Images hide caption

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Bloomberg/Bloomberg via Getty Images