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WASHINGTON, DC - JANUARY 12: (AFP OUT) U.S. President Barack Obama (R) presents the Medal of Freedom to Vice-President Joe Biden during an event in the State Dinning room of the White House, January 12, 2017 in Washington, DC. (Photo by Olivier Douliery-Pool/Getty Images)

WASHINGTON, DC - JANUARY 12:  (AFP OUT) U.S. President Barack Obama (R) presents the Medal of Freedom to Vice-President Joe Biden during an event  in the State Dinning room of the White House, January 12, 2017 in Washington, DC.  (Photo by Olivier Douliery-Pool/Getty Images)

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US vice presidential nominee Senator Joe Biden (L) and Democratic presidential nominee Senator Barack Obama (R) enjoy ice cream cones as they speak with local residents at the Windmill Ice Cream Shop in Aliquippa, Pennsylvania, August 29, 2008. AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US vice presidential nominee Senator Joe Biden (L) and Democratic presidential nominee Senator Barack Obama (R) enjoy ice cream cones as they speak with local residents at the Windmill Ice Cream Shop in Aliquippa, Pennsylvania, August 29, 2008. AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

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WASHINGTON, DC - JANUARY 20: U.S. Vice President Joe Biden applauds President Barack Obama during the State of the Union address on January 20, 2015 in the House Chamber of the U.S. Capitol in Washington, DC. Obama was expected to lay out a broad agenda to address income inequality, making it easier for Americans to afford college education, and child care. (Photo by Mandel Ngan-Pool/Getty Images)

WASHINGTON, DC - JANUARY 20:  U.S. Vice President Joe Biden applauds President Barack Obama during the State of the Union address on January 20, 2015 in the House Chamber of the U.S. Capitol in Washington, DC. Obama was expected to lay out a broad agenda to address income inequality, making it easier for Americans to afford college education, and child care.  (Photo by Mandel Ngan-Pool/Getty Images)

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TOPSHOT - US President Barack Obama awards Vice President Joe Biden the Presidential Medal of Freedom during a tribute to Biden at the White House in Washington, DC, on January 12, 2017. / AFP PHOTO / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

TOPSHOT - US President Barack Obama awards Vice President Joe Biden the Presidential Medal of Freedom during a tribute to Biden at the White House in Washington, DC, on January 12, 2017. / AFP PHOTO / NICHOLAS KAMM        (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)

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US President Barack Obama laughs alongside US Vice President Joe Biden as they sit courtside during the first half of the NCAA men's college basketball game between Georgetown and Duke at the Verizon Center in Washington on January 30, 2010. AFP PHOTO/Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)

US President Barack Obama laughs alongside US Vice President Joe Biden as they sit courtside during the first half of the NCAA men's college basketball game between Georgetown and Duke at the Verizon Center in Washington on January 30, 2010.       AFP PHOTO/Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)