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a clear lead over nikki haley and ron desantis in the final nbc news/des moines register/mediacom poll. our team is in place covering it all this evening. hallie jackson starts us off. >> reporter: tonight a brutal freeze and below zero wind chill on caucus night with candidates carefully crisscrossing iowa. but despite the low temperatures high expectations for former president trump. >> you can't sit home. if you're sick as a dog, you say darling, i've got to make it. even if you vote and then pass away, it's worth it. >> reporter: new polling shows mr. trump 28 points ahead of the rest of the field, with florida governor ron desantis slipping to third just behind former u.n. ambassador nikki haley, who's taking attacks from her rivals. >> she loses to everybody. and she's really not much of a republican. >> reporter: mr. trump has visited iowa less often than his competitors, but his