Democratic presidential nominee Hillary Clinton arrives for a rally at the University of North Carolina at Greensboro on September 15, 2016 in Greensboro, North Carolina. Hillary Clinton returned Thursday to the campaign fray in a tightening race against Republican Donald Trump, who released new details of his physical fitness in response to the health scare that sidelined his rival. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
