Mars CaÉe News Today

Good very early morning to you. frigid, i know, but a make or break day for these candidates. >> reporter: it is frigid indeed. my location its negative 15 degrees right now at this very early hour here at the mars caée in des moines. it really does feel like a much different caucus season this time around and there are a couple reasons for that. one has just been that donald trumps lead here has been so dominant the entire time that there really is kind of this sense -- the adrenaline rush, th...