5 Things to Watch for on Iowa Caucus Day
John Olsen, also known as Dr. Vote, stands outside Drake Univeristy after being turned away from the townhall with Dr. Ben Carson in Des Moines, Iowa, January 22, 2016, ahead of the Iowa Caucus.
( JIM WATSON/AFP / Getty )
( JIM WATSON/AFP / Getty )
Produced by WNYC