Dick Cheney

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Former Vice President Dick Cheney and his daughter, Liz Cheney, will appear together at the Freedom Conference in Colorado. (Associated Press)

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President Bush is applauded by Vice President Dick Cheney (left) and House Speaker Dennis Hastert, of Ill. while delivering his State of the Union address to a joint session of Congress in 2004. (Associated Press)

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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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From left, former British Prime Minister Tony Blair, former Secretary of State Condoleezza Rice, former Vice President Dick Cheney, and former President George W. Bush's daughter Jenna Bush Hager, participate in the singing of "God Bless America" at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

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Former President George W. Bush's daughter, Jenna Bush Hager, center, is seated with her husband Henry Hager, second right, sister Barbara Bush, right, former Secretary of State Condoleezza Rice, left, and former Vice President Dick Cheney, as she is acknowledged by her father at the dedication of the George W. Bush presidential library on the campus of Southern Methodist University in Dallas, Thursday, April 25, 2013. (AP Photo/Charles Dharapak)

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**FILE** Liz Cheney poses questions to her father, former Vice President Dick Cheney, while discussing his newly published book, “In My Time: A Personal and Political Memoir," which was co-authored by Ms. Cheney, at the Ronald Reagan Presidential Library and Museum in Simi Valley, Calif., on Sept. 20, 2011. (Associated Press)

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Vice President Dick Cheney waves to the crowd with Rep. Jim DeMint (right), South Carolina Republican, at a fundraising dinner for Mr. DeMint's senatorial race at the Myrtle Beach Convention Center on Friday, July 23, 2004, in Myrtle Beach, S.C. (AP Photo/Willis Glassgow)

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Former Vice President Dick Cheney, who also served five terms as Wyoming’s representative in the U.S. House, returns to Capitol Hill on Tuesday to meet with Senate Republican leaders at a political strategy luncheon. He is accompanied by Sen. John Barrasso of Wyoming (left), the Republican Policy Committee chairman. (Associated Press)

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Former Vice President Dick Cheney, who also served five terms as Wyoming's representative in the House, returns July 17, 2012, to the Capitol in Washington to meet with Senate Republican leaders at a political strategy luncheon. He is accompanied by Sen. John Barrasso of Wyoming, the Republican Policy Committee chairman. (Associated Press)