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record-setting night for him. if the former president wins by 13 points or more, that would be the biggest margin of victory for a republican who's not an incumbent ever. lester? >> hallie jackson, thank you. as iowa's republicans gather, just what are these caucuses where voters meet to discuss the candidates and then make their choices? jacob soboroff is where a large group of caucusgoers is expected tonight in ottumwa, iowa. jacob. >> reporter: lester, good evening. this is ottumwa high school in wapello county. it's what's known as a supercaucus location. that's because multiple precincts will be voting all under this one roof this evening. they expect as many as 1,000 people here. but picking a candidate is not the first decision that these folks have to make. with the wind chill factor making it feel like 40 degrees below zero in parts of the state, the first decision iowans face tonight is whether or not to venture out to their caucus site. >> 100%. this is iowa. >> the real supporters, they come