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HOUSTON, TX - MARCH 29:  Barbara Bush talks with Republican presidential candidate, former Massachusetts Gov. Mitt Romney at Former President George H. W. Bush's office on March 29, 2012 in Houston, Texas. Mitt Romney received an endorsement from Former President George H.W. Bush and Barbara Bush during the meeting.  (Photo by Tom Pennington/Getty Images)
HOUSTON, TX - MARCH 29:  Barbara Bush talks with Republican presidential candidate, former Massachusetts Gov. Mitt Romney at Former President George H. W. Bush's office on March 29, 2012 in Houston, Texas. Mitt Romney received an endorsement from Former President George H.W. Bush and Barbara Bush during the meeting.  (Photo by Tom Pennington/Getty Images)

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    Barbara Bush's legacy

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Barbara Bush's legacy

First Lady of the United States, mother to a US president and "The Enforcer" are just a few of the titles Barbara Bush can claim.

Barbara Bush's legacy

First Lady of the United States, mother to a US president and "The Enforcer" are just a few of the titles Barbara Bush can claim.