Gatherings, secret ballots. This year the added complication of extreme weather may be the biggest wildcard in a state where voters have to show their support in person and at a very specific time, how much will a subzero Chill And Snow impact Decision Making . Nbcs Priscilla Thompson is in sioux center, iowa, on the move for us. Priscilla, whats required of caucusgoers and what are they saying about the weather . Reporter ana, theyre going to be in that room by 7 00 p. M. In order to caucus, and the weather is a big concern. Its why were in the car right now. Were driving through some of these rural areas. We actually have a camera on the dashboard to give you a look at what were talking about. Youve got the road still covered with snow. In some of the city centers like Des Moines theyve been able to get the plows out and clear those roads. Here a lot of the main roads are clear. When you get into some of these