John B. Judis tells us about the populist movement that began in the United States in the 1890s, the politics of which have recurred on both sides of the Atlantic ever since. Populism, on both the right and the left, champions the people against an establishment, based on issues - globalization, free trade, immigration - on which there has been a strong elite consensus, but also an even stronger mass discontent that is now breaking out in the open