Joe Biden

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Vice President Joe Biden, left, accompanied by his wife wife Jill Biden, signs a condolence book inside the South African Embassy in Washington, Monday, Dec. 9, 2013, as they paid their respects to former South African President Nelson Mandela. During the visit Biden said that the former president was, "the most remarkable man I met in my whole career." President Obama is en route to South Africa to attend a Tuesday memorial service for Mandela. (AP Photo/Jacquelyn Martin)

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Vice President Joe Biden, accompanied by his wife Jill, signs a condolence book inside the South African Embassy in Washington, Monday, Dec. 9, 2013, as they paid their respects to former South African President Nelson Mandela. (AP Photo/Jacquelyn Martin)

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U.S. Vice President Joe Biden, left, looks through binoculars to see North Korea with his granddaughter Finnegan Biden from Observation Post Ouellette during a tour of the Demilitarized Zone (DMZ), near the border village of Panmunjom, which has separated the two Koreas since the Korean War, South Korea, Saturday, Dec. 7, 2013. (Associated Press)

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U.S. Vice President Joe Biden, left, looks through binoculars to see North Korea with his granddaughter Finnegan Biden from Observation Post Ouellette during a tour of the Demilitarized Zone (DMZ), near the border village of Panmunjom, which has separated the two Koreas since the Korean War, South Korea, Saturday, Dec. 7, 2013. Biden praised North Korea's release of an elderly U.S. tourist Saturday, but admonished the North for detaining him in the first place and called for another detained American to be swiftly released. (AP Photo/Lee Jin-man, Pool)