Rand Paul

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** FILE ** Sen. Rand Paul, Kentucky Republican, addresses the 114th annual national convention of the Veterans of Foreign Wars on Monday, July 22, 2013, at the Kentucky International Convention Center in Louisville, Ky. (AP Photo/Timothy D. Easley)

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** FILE ** Liz Cheney, who espouses the neoconservative views of her father, former Vice President Dick Cheney, is challenging Sen. Michael B. Enzi, who has been swiftly endorsed by libertarian Sen. Rand Paul. (Associated Press)

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Sen. Rand Paul, R-Ky., listens as Sen. Kirsten Gillibrand, D-N.Y., speaks to reporters during a news conference on Capitol Hill in Washington, July 16, 2013. (Associated Press)

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** FILE ** Sen. Rand Paul, Kentucky Republican, speaks at a tea party rally against the Internal Revenue Service titled "Audit the IRS" on the West Lawn of the U.S. Capitol in Washington on Wednesday, June 19, 2013. (Andrew Harnik/The Washington Times)

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Sen. Rand Paul (R-Ky.) speaks at a tea party rally against the Internal Revenue Service entitled, "Audit the IRS" on the West Lawn of the U.S. Capitol Building, Washington, D.C., Wednesday, June 19, 2013. (Andrew Harnik/The Washington Times)

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Sen. Rand Paul (R-Ky.) greets supporters after speaking at a tea party rally against the Internal Revenue Service entitled, "Audit the IRS" on the West Lawn of the U.S. Capitol Building, Washington, D.C., Wednesday, June 19, 2013. (Andrew Harnik/The Washington Times)

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** FILE ** Sen. Rand Paul (R-Ky.) greets supporters after speaking at a tea party rally on the West Lawn of the U.S. Capitol Building, Washington, D.C., Wednesday, June 19, 2013. (Andrew Harnik/The Washington Times)

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Supporters take photographs of Sen. Rand Paul (R-Ky.), right, after he speaks at a tea party rally against the Internal Revenue Service entitled, "Audit the IRS" on the West Lawn of the U.S. Capitol Building, Washington, D.C., Wednesday, June 19, 2013. (Andrew Harnik/The Washington Times)

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Sen. Rand Paul (R-Ky.) speaks at a tea party rally against the Internal Revenue Service entitled, "Audit the IRS" on the West Lawn of the U.S. Capitol Building, Washington, D.C., Wednesday, June 19, 2013. (Andrew Harnik/The Washington Times)

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Sen. Rand Paul (R-Ky.) greets supporters after speaking at a tea party rally against the Internal Revenue Service entitled, "Audit the IRS" on the West Lawn of the U.S. Capitol Building, Washington, D.C., Wednesday, June 19, 2013. (Andrew Harnik/The Washington Times)