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DEC 1977, 12-10-1977; Vice Pres. Walter Mondale; (Photo By Ernie Leyba/The Denver Post via Getty Images)

DEC 1977, 12-10-1977; Vice Pres. Walter Mondale;  (Photo By Ernie Leyba/The Denver Post via Getty Images)

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15th July 1976: Democratic Presidential nominee Jimmy Carter raises hands with Vice Presidential nominee Walter Mondale (right) at the Democratic National Convention, New York City. Carter's wife, Rosalynn, and their daughter Amy, wave beside them. (Photo by Hulton Archive/Getty Images)

15th July 1976:  Democratic Presidential nominee Jimmy Carter raises hands with Vice Presidential nominee Walter Mondale (right) at the Democratic National Convention, New York City. Carter's wife, Rosalynn, and their daughter Amy, wave beside them.  (Photo by Hulton Archive/Getty Images)

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Politics, Personalities, USA, pic: November 1976, Plains, Georgia, President elect Jimmy Carter, right, pictured with Vice President elect Walter Mondale, Jimmy Carter (born 1924) became the 39th President of the United States 1977-1981 (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

Politics, Personalities, USA, pic: November 1976, Plains, Georgia, President elect Jimmy Carter, right, pictured with Vice President elect Walter Mondale, Jimmy Carter (born 1924) became the 39th President of the United States 1977-1981  (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

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Former American Vice President, former Senator of Minnesota and Democratic candidate in the 1984 presidential election Walter Mondale. (Photo by Ira Wyman/Sygma via Getty Images)

Former American Vice President, former Senator of Minnesota and Democratic candidate in the 1984 presidential election Walter Mondale. (Photo by Ira Wyman/Sygma via Getty Images)

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Washington, UNITED STATES: Former US vice president Walter Mondale makes remarks during the unveiling ceremony of the statue Norway's late Crown Princess Martha 18 September 2005 at the Norwegian embassy in Washington. Mondale, himself of Norwegian descent, serves as chairman of the Centennial Gift committee of the Norwegian American Foundation, which gave the statue as a gift in honor of the country's centennial. King Harald V and his sisters, Princess Astrid and Princess Ragnhild, took refuge with their mother, Princess Martha, for five years during World War II in Washington and spent some months at the White House as guests of President Franklin D. Roosevelt. AFP PHOTO/Chip SOMODEVILLA (Photo credit should read CHIP SOMODEVILLA/AFP via Getty Images)

Washington, UNITED STATES:  Former US vice president Walter Mondale makes remarks during the unveiling ceremony of the statue Norway's late Crown Princess Martha 18 September 2005 at the Norwegian embassy in Washington. Mondale, himself of Norwegian descent, serves as chairman of the Centennial Gift committee of the Norwegian American Foundation, which gave the statue as a gift in honor of the country's centennial. King Harald V and his sisters, Princess Astrid and Princess Ragnhild, took refuge with their mother, Princess Martha, for five years during World War II in Washington and spent some months at the White House as guests of President Franklin D. Roosevelt.    AFP PHOTO/Chip SOMODEVILLA  (Photo credit should read CHIP SOMODEVILLA/AFP via Getty Images)