George H.W. Bush through the years

Former President George H.W. Bush remained in guarded condition in the intensive care unit at a Houston hospital.

Republican presidential candidate and former Massachusetts Gov. Mitt Romney, left, meets with former President George H.W. Bush and Barbara Bush to receive their endorsements Thursday, March 29, 2012, in Houston. (AP Photo/Pat Sullivan)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney, left, meets with former President George H.W. Bush and Barbara Bush to receive their endorsements Thursday, March 29, 2012, in Houston. (AP Photo/Pat Sullivan)

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