>> let's get right to rachel scott. ron desantis has staked so much of his campaign on iowa. a big test for nikki haley. she's within single digits. we mentioned donald trump in new hampshire but she has to perform in iowa first. then there's donald trump going in nearly the 30 points ahead. it is really his to lose tonight. >> reporter: yes, and donald trump lost the state back in 2016. back then he had no operation here on the ground. this time a totally different story. the trump campaign has built up a robust operation. the former president even making personal phone call to supporters today. the former president hoping for a decisive victory to send a message to his rivals that this his nomination for taking it. >> let's get right to nikki haley's headquarters. all eyes on the race for second between nikki haley, ron desantis, and whether haley can really capitalize on any recent momentum. >> reporter: yeah, david, nikki haley expects to have a strong showing telling me she thinks it will be a two-man race once we