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UNIVERSITY PARK, PENNSYLVANIA - APRIL 19: Democratic presidential candidate Bernie Sanders speaks at a rally at the Rec Hall at Penn State University on April 19, 2016 in University Park, Pennsylvania. Pennsylvania will hold its primary election on April 26, 2016. (Photo by Jeff Swensen/Getty Images)

UNIVERSITY PARK, PENNSYLVANIA - APRIL 19: Democratic presidential candidate Bernie Sanders speaks at a rally at the Rec Hall at Penn State University on April 19, 2016 in University Park, Pennsylvania.  Pennsylvania will hold its primary election on April 26, 2016. (Photo by Jeff Swensen/Getty Images)