Iowa caucuses: KCCI chief political reporter Amanda Rooker explains when, where and how to caucus Subscribe to KCCI on YouTube now for more: http://bit.ly/QY3wuM Get more Des Moines news: http://www.kcci.com Like us: http://facebook.com/kcci8 Follow us: http://twitter.com/KCCINews Instagram: https://www.instagram.com/kcci8/