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Portrait of the forty-first president of the United States George Bush, circa 1989. (Photo by Hulton Archive/Getty Images)

Portrait of the forty-first president of the United States George Bush, circa 1989. (Photo by Hulton Archive/Getty Images)

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373925 03: George Bush looks off April 1, 1981 in Washington, D.C. On January 20, 1981 he took the oath of Vice President of the Untied States for the first of two terms. (Photo by Dirck Halstead/Liaison)

373925 03: George Bush looks off April 1, 1981 in Washington, D.C. On January 20, 1981 he took the oath of Vice President of the Untied States for the first of two terms. (Photo by Dirck Halstead/Liaison)

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381368 04: Former President George Bush speaks about the importance of the republican vote during a rally at a local high school November 5, 2000 in Chesterfield, MO. Bush was stumping for votes for his son Republican presidential candidate George W. Bush. (Photo by Bill Greenblatt/Liaison)

381368 04: Former President George Bush speaks about the importance of the republican vote during a rally at a local high school November 5, 2000 in Chesterfield, MO. Bush was stumping for votes for his son Republican presidential candidate George W. Bush. (Photo by Bill Greenblatt/Liaison)

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381368 03: Former President George Bush speaks about the importance of the republican vote during a rally at a local high school November 5, 2000 in Chesterfield, MO. Bush was stumping for votes for his son Republican presidential candidate George W. Bush. (Photo by Bill Greenblatt/Liaison)

381368 03: Former President George Bush speaks about the importance of the republican vote during a rally at a local high school November 5, 2000 in Chesterfield, MO. Bush was stumping for votes for his son Republican presidential candidate George W. Bush. (Photo by Bill Greenblatt/Liaison)

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DELRAY BEACH, FL - DECEMBER 4: Former U.S. President George H. Bush participates in the Chris Evert Pro Celebrity Tennis Classic at the Delray Beach Tennis Center on December 4, 2005 in Delray Beach, Florida. (Photo by Ralph Notaro/Getty Images)

DELRAY BEACH, FL - DECEMBER 4:  Former U.S. President George H. Bush participates in the Chris Evert Pro Celebrity Tennis Classic at the Delray Beach Tennis Center on December 4, 2005 in Delray Beach, Florida.  (Photo by Ralph Notaro/Getty Images)