We've had a brutal dose of cold weather and snow storms this week.  It's going to continue through the weekend... but this isn't just a Utah problem... millions are getting blasted by winter. Air Travel is being affected in a big way. Many states under alert for extreme weather. A threat for turnout is being posed for the Iowa caucus as its expected to be in the negatives. Brooke Shafer, NewsNation National Correspondent is in Iowa and sets the scene.