President Obama delivers remarks during an interfaith memorial service honoring five slain police officers, Tuesday at the Morton H. Meyerson Symphony Center in Dallas. Tom Pennington/Getty Images hide caption

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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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Listen to NPR Special Coverage: Obama's Years

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President Obama Defends His Record On Race

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

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

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Presumptive Republican nominee Donald Trump has a love/hate relationship with the press, drawing high levels of publicity while limiting access to media organizations. Jan Kruger/Getty Images hide caption

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The White House was illuminated in rainbow-colored light on June 26, 2015, after the Supreme Court issued a ruling that made same-sex marriage legal nationwide. Drew Angerer/Bloomberg via Getty Images hide caption

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Not Always A 'Thunderbolt': The Evolution Of LGBT Rights Under Obama

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President Obama and Japanese Prime Minister Shinzo Abe lay wreaths at the Hiroshima Peace Memorial Park in Hiroshima on Friday. Jim Watson/AFP/Getty Images hide caption

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President Obama's Full Remarks At Hiroshima

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Demonstrators gather in a silent rally to mourn the death of an Okinawa woman in front of Camp Zukeran on May 22. The crime is thrusting the opposition to the U.S. presence on Okinawa back in the spotlight. The Asahi Shimbun/The Asahi Shimbun via Getty Images hide caption

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As President Visits Japan, Okinawa Controversy Is Back In The Limelight

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