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Photo of US President Jimmy Carter jogging on the South Lawn of Washington December 13 1978. (FILM) (Photo credit should read KARL SCHUMACHER/AFP/Getty Images)

Photo of US President Jimmy Carter jogging on the South Lawn of Washington December 13 1978.                (FILM)        (Photo credit should read KARL SCHUMACHER/AFP/Getty Images)

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Plains - August 21: President Carter and Amy Carter photo shoot for their new children's book, "The Little Baby Snoogle-Fleejer," in Plains Georgia on August 21, 1995 (Photo By Rick Diamond/Getty Images)

Plains - August 21: President Carter and Amy Carter photo shoot for their new children's book, "The Little Baby Snoogle-Fleejer," in Plains Georgia on August 21, 1995 (Photo By Rick Diamond/Getty Images)

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ATLANTA, GA - SEPTEMBER 17: Former President Jimmy Carter and his wife Rosalynn look on prior to the game between the Atlanta Braves and the Toronto Blue Jays at Turner Field on September 17, 2015 in Atlanta, Georgia. (Photo by Kevin C. Cox/Getty Images)

ATLANTA, GA - SEPTEMBER 17:  Former President Jimmy Carter and his wife Rosalynn look on prior to the game between the Atlanta Braves and the Toronto Blue Jays at Turner Field on September 17, 2015 in Atlanta, Georgia.  (Photo by Kevin C. Cox/Getty Images)

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LAGRANGE, GA - JUNE 10: Former U.S. President Jimmy Carter and his wife Rosalyn attach siding to the front of a Habitat for Humanity home being built June 10, 2003 in LaGrange, Georgia. More than 90 homes are being built in LaGrange; Valdosta, Georgia; and Anniston, Alabama by volunteers as part of Habitat for Humanity International's Jimmy Carter Work Project 2003. (Photo by Erik S. Lesser/Getty Images)

LAGRANGE, GA - JUNE 10:  Former U.S. President Jimmy Carter and his wife Rosalyn attach siding to the front of a Habitat for Humanity home being built June 10, 2003 in LaGrange, Georgia. More than 90 homes are being built in LaGrange; Valdosta, Georgia; and Anniston, Alabama by volunteers as part of Habitat for Humanity International's Jimmy Carter Work Project 2003.  (Photo by Erik S. Lesser/Getty Images)