. >>> i'm dorcy spencer on the scene of a waterer main break on a live report ahead. >> we are finally on the eve of the iowa caucuses. good evening, everyone. for nearly a year, you've heard from the candidates. now, the voters will have their say. news 4's is in des moines with a taste of iowa. >> this political billboard is the first thing you'll see leaving the des moines airport. ben car sob's face is the last thing you'll see before you take off. >> scott is finishing his senior year studying politics at georgetown. he made the trip back to iowa to caucus. >> there's nowhere else that i can think of that you're having these conversations where you go to you person on the street and saying this is why i support candidate x. what are your issues? how can i get you to come over to my side. >> they're like most iowa families. talking politics mat others. it's a deeply held stwra digs that iowa works to hold onto, mixing it up with if candidates, face-to-face, unique experiencing that can translate into a vote. >> it's the first opportunity to really plak a state about who's going to