FILE - In this July 5, 2016 photo, President Barack Obama waves as he walks across the South Lawn of the White House, in Washington, as he returns from Charlotte, N.C. where he participated in a campaign event with Democratic presidential candidate Hillary Clinton. Obama is interrupting his summer vacation to do some campaigning for Hillary Clinton, the Democratic presidential nominee. Obama is slated to headline a Democratic Party reception Monday, Aug. 15, 2016, on Martha's Vineyard, the tony Massachusetts island where he's been vacationing with his family. (AP Photo/Carolyn Kaster, File) **FILE**
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