Republican National Committee Chairman Reince Priebus at the Republican National Convention in Cleveland. The RNC is largely supplementing the Trump campaign when it comes to on-the-ground staff. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP

Pence and his wife, Karen, leave a meeting with Trump in New York on Friday. Evan Vucci/AP hide caption

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Evan Vucci/AP

Meet Mike Pence, 'Midwestern Polite' With An Unrelenting Conservative Message

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Former New York City Mayor Rudy Giuliani delivers a passionate speech on the first day of the Republican National Convention. Win McNamee/Getty Images hide caption

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Former President George W. Bush (above); his father, former President George H.W. Bush; and brother Jeb Bush, who ran for president this year, will not be attending this week's Republican National Convention in Cleveland. Matt Rourke/AP hide caption

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Matt Rourke/AP

Reince Priebus, chairman of the Republican National Committee, says current conflicts between candidates won't affect the GOP's strength in the general election. J. Scott Applewhite/AP hide caption

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Republican Party Chairman: 'This Will Be Just Fine'

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People hold signs, including some reading "America is ready for marriage," at a same-sex marriage victory celebration on Oct. 6 in Salt Lake City, Utah. America may be ready, but Republicans aren't: Rising popular support for same-sex marriage is posing a problem for the GOP. George Frey/Getty Images hide caption

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Turf Shifts In Culture Wars As Support For Gay Marriage Rises

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Republican National Committee chairman Reince Priebus is seen at the Jan. 24 RNC winter meeting in Washington. Priebus celebrates the achievements of black Republicans in a series of new radio ads designed to honor Black History Month. Susan Walsh/AP hide caption

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Susan Walsh/AP

Republican presidential candidate Mitt Romney and vice presidential candidate Paul Ryan on stage with their wives Ann Romney and Janna Ryan at the Republican National Convention on Aug. 30. Jae C. Hong/AP hide caption

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Jae C. Hong/AP