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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! >> reporter: tomorrow, january 15th, i need each and every one of you to get out, everybody, everybody get out and vote. bring your friend. we say plus ten. so plus ten or plus two or plus 20, but bring them all out because we have to set the stage for november. >> reporter: on the eve of the