Election 2020: How do America s presidential primaries work?

As the Democratic primary race enters its busiest period, John Prideaux, The Economist s US editor, gives his essential guide to understanding the process by which America s presidential candidates are chosen. Read more here: https://econ.st/2IdvpvD Click here to subscribe to The Economist on YouTube: https://econ.st/2xvTKdy For more from Economist Films visit: http://films.economist.com/