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Dr. Thomas File, president of the National Foundation for Infectious Diseases, describes a vaccine in an examination room at Akron City Hospital's Infectious Disease Office in April 2013, in Akron, Ohio. (Ed Suba Jr./Akron Beacon Journal)
PHILADELPHIA: His own legacy on the line, President Barack Obama implored Americans to elect Hillary Clinton to the White House, casting her as a candidate who believes in the optimism that powers the nation’s democracy and warning against the “deeply pessimistic vision” of Republican Donald Trump.