>> reporter: well, kasie, nikki haley telling iowans they have the opportunity to set the tone for the rest of the country. governor desantis expressing confidence in the extensive ground operation that his team has built here. former president donald trump telling supporters that they should not take anything for granted. you know, after months of campaigning, millions of dollars in ads, this contest here in iowa could all come down to how iowans navigate this brutal weather. the 2024 presidential race is heating up as temperatures are dropping in iowa. >> get excited. >> reporter: iowans are battling snow and below zero temperatures as they head out to caucus in the first voting event to determine the republican nominee for president. >> so brave the weather and go out and save america. >> reporter: iowa's gop chairman