Nick Whitfield(R), a Bernie Sanders campaign volunteer speaks to a resident as he canvases a residential neighborhood on January 31, 2016 in West Burlington, Iowa. Whitfield, of Springfield, Illinois, traveled to Iowa to help as campaign offices are operating at an elevated level as Iowa prepares for the state-wide caucuses on February 1. / AFP / Michael B. Thomas (Photo credit should read MICHAEL B. THOMAS/AFP via Getty Images)
