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US President Barack Obama gestures before speaking during his farewell address in Chicago, Illinois on January 10, 2017.
Barack Obama closes the book on his presidency, with a farewell speech in Chicago that will try to lift supporters shaken by Donald Trump's shock election. / AFP / Joshua LOTT        (Photo credit should read JOSHUA LOTT/AFP/Getty Images)
US President Barack Obama gestures before speaking during his farewell address in Chicago, Illinois on January 10, 2017.
Barack Obama closes the book on his presidency, with a farewell speech in Chicago that will try to lift supporters shaken by Donald Trump's shock election. / AFP / Joshua LOTT        (Photo credit should read JOSHUA LOTT/AFP/Getty Images)

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    Obama's friend and colleague on his legacy

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Obama's friend and colleague on his legacy

Arne Duncan, President Obama's long-time Education Secretary and one of his closest friends in the administration, talks to Christiane Amanpour about his legacy.

Obama's friend and colleague on his legacy

Arne Duncan, President Obama's long-time Education Secretary and one of his closest friends in the administration, talks to Christiane Amanpour about his legacy.