Election 2020: how are the American presidential primaries going?

As the Democratic primary race enters its busiest period, John Prideaux, US editor-in-chief of The Economist, provides his essential guide to understanding the process by which US presidential candidates are chosen. To learn more, click here: https://econ.st/2IdvpvD Click here to subscribe to The Economist on YouTube: https://econ.st/2xvTKdy To learn more about Economist Films, visit: http:/ /films.economist.com/

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