What is a caucus and how does it work? As the 2016 Presidential race heats up, Sky News helps you understand one of the key moments in the contest for the white house.
SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews
Follow us on Twitter: https://twitter.com/skynews and https://twitter.com/skynewsbreak
Like us on Facebook: https://www.facebook.com/skynews
For more content go to http://news.sky.com and download our apps:
iPad https://itunes.apple.com/gb/app/Sky-News-for-iPad/id422583124
iPhone https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8
Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB