Laura Bush

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Former first lady Laura Bush, from left, former President George W. Bush, first lady Michelle Obama and President Barack Obama hold hands to their hearts during the national anthem as friends and relatives of the victims of 9/11 gather for a ceremony marking the 10th anniversary of the attacks at the National September 11 Memorial at the World Trade Center site, Sunday, Sept. 11, 2011, in New York. (AP Photo/Jason DeCrow)

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Observing a moment of silence at the National September 11 Memorial in New York on Sunday, Sept. 11, 2011, are (from right) President Obama, first lady Michelle Obama, former President George W. Bush and former first lady Laura Bush. (AP Photo/Mary Altaffer)

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Standing for the national anthem at the ceremony in New York on Sunday, Sept. 11, 2011, to mark the 10th anniversary of the 9/11 attacks are (from lower left) former first lady Laura Bush, former President George W. Bush, first lady Michelle Obama and President Obama. (AP Photo/Mark Lennihan)

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From left; President Barack Obama meets Michaele Salahi, President Bush and first lady Laura Bush, first lady Hillary Rodham Clinton dances with Argentine President Carlos Menem and (background) Mexico President Vicente Fox saw fireworks at his White House visit. (Photos: Associated Press and The Washington Times)

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Former President George W. Bush, right, speakes with his wife Laura Bush by his side during the ground breaking ceremony for the President George W. Bush Presidential Center at SMU in Dallas, Tuesday, Nov. 16, 2010. (AP Photo/LM Otero)

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Former President George W. Bush, left, waves as he and his wife Laura Bush take the stage before the ground breaking ceremony for the President George W. Bush Presidential Center at SMU in Dallas, Tuesday, Nov. 16, 2010. (AP Photo/LM Otero)

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Laura Bush, right, and former President George W. Bush attend the ground breaking ceremony for the President George W. Bush Presidential Center at SMU in Dallas, Tuesday, Nov. 16, 2010. (AP Photo/LM Otero)

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Former President George W. Bush, left,, and his wife Laura Bush pick up shovels of dirt during the ground breaking ceremony for the President George W. Bush Presidential Center at SMU in Dallas, Tuesday, Nov. 16, 2010. (AP Photo/LM Otero)

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Laura Bush

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** FILE ** Former first lady Laura Bush and former President George W. Bush visit Southern Methodist University in Dallas, the future site of the George W. Bush Presidential Center, in November 2009. (Associated Press)

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** FILE ** As his eight-year presidency nears the end, President George W. Bush and first lady Laura Bush are joined by two unidentified girls as they light the National Christmas Tree. (Rod Lamkey Jr./ The Washington Times)

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In this 2002 file photo, President Bush holds his Scottish terrier Barney as he and first lady Laura Bush walk to board Air Force One at Andrews Air Force Base, Md. Boston Celtics public relations director Heather Walker acknowledged a published report Friday that Barney bit her wrist and drew blood as she tried to pat the Scottish terrier after a White House ceremony honoring the team's 17th NBA championship. (Associated Press)