Campaigning before republicans in the Iowa Caucus choose their next president ial candidate. There is one thing out of their control. The brutal weather. Major garrett is in Des Moines for us tonight. Major, good evening. Reporter good evening, weijia. Weather really is the unavoidable Iowa Caucus story. It took us two days to fly here. The closest we got is minneapolis. Whiteout conditions, fierce winds, subzero temperatures are conspiring to slow candidates down, punting what would ordinarily be a frenzied campaign to the finish. The Final Push in iowa looks like this. Candidates scraping for momentum in subzero windchills. Here i am in negative temperatures. I am not going to be canceling if people are willing to come out and hear from me, i am going to show up all the way to the end of this caucus. The fellas are scared. Im telling you. You can see our numbers going up in the polls. Reporter the far away