Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, speaks during a campaign stop in Davenport, Iowa, U.S., on Tuesday, Oct. 6, 2015. Clinton is in the midst of one final round of visits to the key primary states ahead of the Oct. 13 debate in Las Vegas and, nine days later, her testimony before the Benghazi committee. Photographer: Daniel Acker/Bloomberg via Getty Images
