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CHARLOTTE, NC - JULY 05: Democratic presidential candidate Hillary Clinton speaks during a campaign rally with U.S. President Barack Obama on July 5, 2016 in Charlotte, North Carolina. Today is President Obama's first appearance on the campaign trail with Clinton. (Photo by Justin Sullivan/Getty Images)

CHARLOTTE, NC - JULY 05:  Democratic presidential candidate Hillary Clinton speaks during a campaign rally with U.S. President Barack Obama on July 5, 2016 in Charlotte, North Carolina. Today is President Obama's first appearance on the campaign trail with Clinton. (Photo by Justin Sullivan/Getty Images)