Rand Paul

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Sen. Rand Paul, Kentucky Republican, listens to a question during a news conference on Capitol Hill in Washington on Oct. 13, 2011. (AP Photo/Manuel Balce Ceneta)

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** FILE ** Sen. Rand Paul, Kentucky Republican, speaks at the Values Voter Summit, sponsored by the Family Research Council, in Washington on Friday, Oct. 11, 2013. (AP Photo/Jose Luis Magana)

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Sen. Rand Paul, Kentucky Republican, speaks during the Values Voter Summit, sponsored by the Family Research Council, on Friday, Oct. 11, 2013, in Washington. (AP Photo/Jose Luis Magana)

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A Public Policy Polling survey found that Sen. Ted Cruz, Texas Republican, has past others including New Jersey Gov. Chris Christie and Sen. Rand Paul of Kentucky to become the top pick of GOP primary voters in the 2016 presidential nomination race. (Associated Press)

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Sen. Rand Paul, Kentucky Republican, leaves the Senate chamber on Capitol Hill in Washington on Wednesday, Sept. 25, 2013, after a procedural vote on a bill to fund the government. Potential 2016 presidential candidates now in Congress, including Mr. Paul, have been relatively silent about a partial government shutdown. (AP Photo/J. Scott Applewhite)

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"I think of instead of the libertarian aspect of the Republican Party being a detriment, I actually think it has come full circle and it really is the way the Republican Party will grow," Sen. Rand Paul, Kentucky Republican, says of his political future. (Associated Press)