Volunteers for Democratic presidential candidate Bernie Sanders speak with a local resident while canvasing neighborhoods on January 31, 2016 in Fort Madison, Iowa, one day before the state’s much anticipated February 1st caucus.
US presidential candidates made a frenzied, final push to lock in Iowa voters on the eve of the first nominating contest of the 2016 election season. (Photo: MICHAEL B. THOMAS/AFP/Getty Images)
Volunteers for Democratic presidential candidate Bernie Sanders speak with a local resident while canvasing neighborhoods on January 31, 2016 in Fort Madison, Iowa, one day before the state’s much anticipated February 1st caucus. US presidential candidates made a frenzied, final push to lock in Iowa voters on the eve of the first nominating contest of the 2016 election season. / AFP / Michael B. Thomas (Photo credit should read MICHAEL B. THOMAS/AFP/Getty Images)
