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WASHINGTON DC, WA - JANUARY 7: Nelson Rockefeller posing for a photo on January 7, 1976 in Washington DC, Washington. (Photo by Santi Visalli/Getty Images)

WASHINGTON DC, WA - JANUARY 7:  Nelson Rockefeller posing for a photo on January 7, 1976 in Washington DC, Washington. (Photo by Santi Visalli/Getty Images)

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American Vice Presidential candidate Nelson Rockefeller, with his wife 'Happy' sitting behind him, speaking to the House Judiciary Committee, Washington DC, November 21st 1974. (Photo by Barry Soorenko/Consolidated News Pictures/Getty Images)

American Vice Presidential candidate Nelson Rockefeller, with his wife 'Happy' sitting behind him, speaking to the House Judiciary Committee, Washington DC, November 21st 1974. (Photo by Barry Soorenko/Consolidated News Pictures/Getty Images)

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Nelson Rockefeller (1908 -79), Republican Governor of New York and Vice-President of the United States 1974 - 77. (Photo by Central Press/Getty Images)

Nelson Rockefeller (1908 -79), Republican Governor of New York and Vice-President of the United States 1974 - 77.   (Photo by Central Press/Getty Images)

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The Republican nominees for the White House celebrate at the Republican National Convention in Kemper Arena, Kansas City, Missouri, August 19, 1976. Pictured are, front row from third left, politician and sitting US Vice President Nelson Rockefeller, politician (and Vice Presidential nominee) Bob Dole, politician and sitting US President Gerald Ford (1913 - 2006), and his wife, US First Lady Betty Ford (1918 - 2011). (Photo by Stock Montage/Getty Images)

The Republican nominees for the White House celebrate at the Republican National Convention in Kemper Arena, Kansas City, Missouri, August 19, 1976. Pictured are, front row from third left, politician and sitting US Vice President Nelson Rockefeller, politician (and Vice Presidential nominee) Bob Dole, politician and sitting US President Gerald Ford (1913 - 2006), and his wife, US First Lady Betty Ford (1918 - 2011). (Photo by Stock Montage/Getty Images)

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WHITE HOUSE - JANUARY 20: (NO U.S. TABLOID SALES) President Gerald R. Ford and First Lady Betty Ford pose with President-elect Jimmy Carter and his wife Rosalynn Carter, Margaretta Rockefeller and husband Vice President Nelson A. Rockefeller, Joan Mondale and husband Vice President-elect Walter Mondale prior to departing the White House for the inauguration of Jimmy Carter as the 39th President of the United States on January 20, 1977 in Washington, DC. (Photo by David Hume Kennerly/Getty Images)

WHITE HOUSE - JANUARY 20: (NO U.S. TABLOID SALES) President Gerald R. Ford and First Lady Betty Ford pose with President-elect Jimmy Carter and his wife Rosalynn Carter, Margaretta Rockefeller and husband Vice President Nelson A. Rockefeller, Joan Mondale and husband Vice President-elect Walter Mondale prior to departing the White House for the inauguration of Jimmy Carter as the 39th President of the United States on  January 20, 1977 in Washington, DC. (Photo by David Hume Kennerly/Getty Images)