Rand Paul

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** FILE ** This April 8, 2014, file photo shows Sen. Rand Paul, R-Ky. speaking on Capitol Hill in Washington. (AP Photo/J. Scott Applewhite, File)

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Sen. Rand Paul, R-Ky., speaks during an event at the University of Chicago's Ida Noyes Hall in Chicago on Tuesday, April 22, 2014. (AP Photo/Andrew A. Nelles)

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Sen. Rand Paul, R-Ky., greets Angelika Noel, 17, during a visit to Josephinum Academy in Chicago to participate in a discussion on school choice on Tuesday, April 22, 2014. (AP Photo/Andrew A. Nelles)

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Sen. Rand Paul, R-Ky., speaks during a visit to Josephinum Academy in Chicago to participate in a discussion on school choice on Tuesday, April 22, 2014. (AP Photo/Andrew A. Nelles)

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Sen. Rand Paul, R-Ky., speaks during a visit to Josephinum Academy in Chicago, an all-girls Catholic high school made up by a majority of lower-income, Hispanic students, to participate in a discussion on school choice on Tuesday, April 22, 2014. (AP Photo/Andrew A. Nelles)

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Sen. Rand Paul, R-Ky., speaks during a visit to Josephinum Academy in Chicago, an all-girls Catholic high school made up by a majority of lower-income, Hispanic students, to participate in a discussion on school choice on Tuesday, April 22, 2014. (AP Photo/Andrew A. Nelles)

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Sen. Rand Paul, R-Ky., speaks during a visit to Josephinum Academy in Chicago, an all-girls Catholic high school made up by a majority of lower-income, Hispanic students, to participate in a discussion on school choice on Tuesday, April 22, 2014. (AP Photo/Andrew A. Nelles)

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Angelika Noel, 17, poses with Sen. Rand Paul, R-Ky., during a visit to Josephinum Academy in Chicago to participate in a discussion on school choice on Tuesday, April 22, 2014. (AP Photo/Andrew A. Nelles)

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Sen. Rand Paul, R-Ky., speaks during a visit to Josephinum Academy in Chicago to participate in a discussion on school choice on Tuesday, April 22, 2014. (AP Photo/Andrew A. Nelles)