George W. Bush Presidential Center

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Former president George W. Bush, left, shakes hands with former president William J. Clinton during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)

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Former President George W. Bush, accompanied by his wife former first lady Laura Bush, flashes the "W" sign after his speech during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)

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Former President George W. Bush, center, shares a laugh with his wife, former first lady Laura Bush, and father, former President George H.W. Bush, during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)

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** FILE ** Former President George W. Bush turns and waves as he follows President Obama and first lady Michelle Obama as they leave after the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/LM Otero)

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From left, President Barack Obama, former president George W. Bush, former president William J. Clinton former President George H.W. Bush and former president Jimmy Carter arrive for the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)

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President Barack Obama listens as former President George W. Bush speaks during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/Tony Gutierrez, Pool)

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Protesters walk with masks on in Dallas near the dedication of the opening of the George W. Bush Presidential Center in Dallas, on Thursday, April 25, 2013. Police arrested at least three people during the protest march. (AP Photo/Mike Fuentes)

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Two protesters wearing costumes near the opening of the George W. Bush Presidential Center are asked by Dallas Police to remain on the sidewalk as The George W. Bush Presidential Center is dedicated in Dallas on Thursday, April 25, 2013. The two protesters wearing costumes were arrested. (AP Photo/Mike Fuentes)

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Former president George W. Bush and his wife, Laura, arrive April 25, 2013, at the dedication of the George W. Bush Presidential Center in Dallas. (Associated Press)

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The bullhorn President Bush used at ground zero following the Sept. 11, 2001 terrorist attacks is seen during a tour of the George W. Bush Presidential Center .

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Statues of former Presidents George W. Bush, left and George HW Bush are seen during a tour of the George W. Bush Presidential Center Wednesday, April 24, 2013, in Dallas. More than 8,000 people are expected to attend the invitation-only dedication of the center, Thursday, April 25, which will house the presidential library and museum along with the 43rd presidentÃs policy institute. It opens to the public on May 1. (AP Photo/David J. Phillip)

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The United States Capitol in Washington, D.C. is seen on a LED screen during a tour of the George W. Bush Presidential Center Wednesday, April 24, 2013, in Dallas. More than 8,000 people are expected to attend the invitation-only dedication of the center, Thursday, April 25, which will house the presidential library and museum along with the 43rd presidentÃs policy institute. It opens to the public on May 1. (AP Photo/David J. Phillip)

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A replica of the Oval Office is seen during a tour of the George W. Bush Presidential Center Wednesday, April 24, 2013, in Dallas. More than 8,000 people are expected to attend the invitation-only dedication of the center, Thursday, April 25, which will house the presidential library and museum along with the 43rd presidentÃs policy institute. It opens to the public on May 1. (AP Photo/David J. Phillip)

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A replica of the Oval Office is seen during a tour of the George W. Bush Presidential Center Wednesday, April 24, 2013, in Dallas. More than 8,000 people are expected to attend the invitation-only dedication of the center, Thursday, April 25, which will house the presidential library and museum along with the 43rd presidentÃs policy institute. It opens to the public on May 1. (AP Photo/David J. Phillip)

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The U.S. constitution is seen on a LED screen during a tour of the George W. Bush Presidential Center Wednesday, April 24, 2013, in Dallas. More than 8,000 people are expected to attend the invitation-only dedication of the center, Thursday, April 25, which will house the presidential library and museum along with the 43rd presidentÃs policy institute. It opens to the public on May 1. (AP Photo/David J. Phillip)

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A display about crisis management is seen during a tour of the George W. Bush Presidential Center Wednesday, April 24, 2013, in Dallas. More than 8,000 people are expected to attend the invitation-only dedication of the center, Thursday, April 25, which will house the presidential library and museum along with the 43rd presidentÃs policy institute. It opens to the public on May 1. (AP Photo/David J. Phillip)

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The bullhorn President George W. Bush used at ground zero in the wake of the Sept. 11, 2001 terrorist attacks is seen during a tour of the George W. Bush Presidential Center Wednesday, April 24, 2013, in Dallas. More than 8,000 people are expected to attend the invitation-only dedication of the center, Thursday, April 25, which will house the presidential library and museum along with the 43rd presidentÃs policy institute. It opens to the public on May 1. (AP Photo/David J. Phillip)

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Memorial bracelets of captured or killed service members, that were given to President George W. Bush, are seen on display during a tour of the George W. Bush Presidential Center Wednesday, April 24, 2013, in Dallas. More than 8,000 people are expected to attend the invitation-only dedication of the center, Thursday, April 25, which will house the presidential library and museum along with the 43rd presidentÃs policy institute. It opens to the public on May 1. (AP Photo/David J. Phillip)

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A display about the Bush administration's faith-based and community initiative is seen during a tour of the George W. Bush Presidential Center Wednesday, April 24, 2013, in Dallas. More than 8,000 people are expected to attend the invitation-only dedication of the center, Thursday, April 25, which will house the presidential library and museum along with the 43rd presidentÃs policy institute. It opens to the public on May 1. (AP Photo/David J. Phillip)