President Obama speaks during the dedication ceremony for the Smithsonian National Museum of African American History and Culture on the National Mall in Washington. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

President Obama smiles during a joint news conference with Singapore's Prime Minister Lee Hsien Loong at the White House Tuesday in Washington, D.C. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

President Obama and Hillary Clinton stand together on stage on the third day of the Democratic National Convention in Philadelphia. Justin Sullivan/Getty Images hide caption

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President Obama makes a statement at the White House about the deadly shooting of police officers in Baton Rouge, La., on Sunday. A day later, he sent an open letter to the nation's law enforcement officers expressing his condolences and support. Yuri Gripas/AFP/Getty Images hide caption

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Yuri Gripas/AFP/Getty Images

Speaking at the White House, President Obama called for unity after the killing of police officers in Baton Rouge, La. on Sunday. Yuri Gripas/AFP/Getty Images hide caption

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Yuri Gripas/AFP/Getty Images

Barack Obama accepts the Democratic presidential nomination at the 2008 Democratic National Convention on Aug. 28, 2008, in Denver. Chuck Kennedy/AFP/Getty Images hide caption

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Chuck Kennedy/AFP/Getty Images

Listen to NPR Special Coverage: Obama's Years

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President Obama is interviewed by Steve Inskeep at the White House on Monday. Ariel Zambelich/NPR hide caption

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Ariel Zambelich/NPR

Listen to NPR Special Coverage: Obama's Years

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President Obama is interviewed by NPR's Steve Inskeep. Ariel Zambelich/NPR hide caption

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Ariel Zambelich/NPR

Obama: Trump Hasn't Captured 'Zeitgeist Of The Country'

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