Sen Lindsey Graham, R-S.C., speaks in July 2015 at Music Man Square in Mason City, Iowa. Graham suspended his campaign for president in December.
Gov. Chris Christie at the Clear Lake, Iowa, firehouse.
Gov. Chris Christie.
Sen. Ted Cruz, R-Texas, speaks at a rally at the Iowa State Fairgrounds in Des Moines.
Sen. Ted Cruz.
Audience members a the Ted Cruz rally. The sign reads, "Choose Cruz."
Rally for Sen. Bernie Sanders, D-Vt., at Five Sullivan Brothers Convention Center in Waterloo.
Sen. Bernie Sanders.
Carly Fiorina at Cabin Coffee Company in Mason City.
Gov. Martin O'Malley, D-Md., speaks at Iowa State University in Ames.
Fog sets in prior to a blizzard as caucus-goers leave the Clear Lake Middle School.