Election 2016: Iowa caucus explained - how presidential candidates are selected

The video explains the process of dividing counties into precincts for delegate selection in Iowa. It details how Democrats and Republicans allocate delegates to their respective national conventions, including the number of delegates needed to win the nomination. The video also covers the procedures during the Iowa caucuses, where representatives speak for candidates and attendees vote by show of hands or paper ballot. For Democrats, candidates must meet a 15% support threshold to be viable, and if not, supporters must switch to a viable candidate's group or find an alternative precinct.

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