PITTSBURGH - JULY 13: Former Secretary of State Hillary Clinton speaks to the audience at the annual convention of the American Federation of Teachers Friday, July 13, 2018 at the David L. Lawrence Convention Center ...

PITTSBURGH - JULY 13: Former Secretary of State Hillary Clinton speaks to the audience at the annual convention of the American Federation of Teachers Friday, July 13, 2018 at the David L. Lawrence Convention Center in Pittsburgh, Pennsylvania. (Photo by Jeff Swensen/Getty Images)

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