U.S. President George W. Bush (R) kisses his mother and former U.S. first lady Barbara Bush, as they attend the Texas A&M University commencement ceremony in College Station, Texas, in this December 12, 2008 file photo. The former first lady was  recovering on March 4, 2009 from heart surgery in a Houston hospital where her aortic valve was replaced, a spokeswoman said. Reuters Pictures logo Reuters Pictures 39 months ago

U.S. President George W. Bush (R) kisses his mother and former U.S. first lady Barbara Bush, as they attend the Texas A&M University commencement ceremony in College Station, Texas, in this December 12, 2008 file photo. The former first lady was recovering on March 4, 2009 from heart surgery in a Houston hospital where her aortic valve was replaced, a spokeswoman said.