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freezing. and the winds are the far bigger concern here. that is why all of the campaigns have their eye on the weather forecast, and even more than that, the specific road conditions. have all these roads been plowed? will they blow over again with all the snow coming here this past week? but because of all of that, all the campaigns, of course, have intense strategies. they know where their supporters are. now the challenge is to get them out to the caucus sites tomorrow evening. erin, across all of this, the biggest picture, can the iowa caucuses be a roadblock for donald trump or a glide path to his nomination? >> brave the weather and go out and save america. because that's what you're doing. >> reporter: donald trump is eyeing a knockout victory in iowa, hoping the first contest sets him on a rocket ride to the republican nomination. >> usa! usa! >> tomorrow, january 15th, i need each and every one of you to get out, everybody, everybody