In this 6 1/2 minute video, CGP Gray explains how the mathematics of a one person/one vote system inevitably leads to a two-party system that pleases almost no one.

Also from CGP Gray:

Lisa Wade, PhD is an Associate Professor at Tulane University. She is the author of American Hookup, a book about college sexual culture; a textbook about gender; and a forthcoming introductory text: Terrible Magnificent Sociology. You can follow her on Twitter and Instagram.