Would-be presidential candidates are ditching "testing the waters" and "exploratory committees" to hold onto unlimited and undisclosed cash for longer. Mark Wilson/Getty Images hide caption

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Hillary Clinton speaks to the media after keynoting a Women's Empowerment Event at the United Nations on Tuesday in New York City. Clinton answered questions about recent allegations of an improperly used email account during her tenure as secretary of state. Yana Paskova/Getty Images hide caption

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Then-U.S. Secretary of State Hillary Clinton sips tea on Turkish television program "Lets come to be with us" at the US Embassy in Ankara March 7, 2009. AFP/Getty Images hide caption

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The Clinton Foundation has taken contributions, of $1 million to $10 million, from the governments of Kuwait and the United Arab Emirates. The Saudi Arabian government has given as much as $25 million. Julie Jacobson/AP hide caption

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Supporters cheer in Colorado Springs, Colo., as a television broadcast declares that Republicans have taken control of the Senate. Republican candidates, party committees and outside groups spent about $44 million more than Democrats, according to the Center for Responsive Politics. Marc Piscotty/Getty Images hide caption

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Sen. Rand Paul, R-Ky., center, meets with members of the Londonderry Fish and Game Club in Litchfield, N.H., on Jan. 14. Paul was one of three GOP presidential hopefuls who attended Sunday's semiannual gathering of David and Charles Koch's donor network in California. Jim Cole/AP hide caption

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Congressional Republicans have "been given a second chance by the American people," AFP President Tim Phillips said. "And we're going to hold them accountable. We're determined about that." Phelan M. Ebenhack/AP hide caption

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