From the protesters in Cairo"s Tahrir Square to the Tea Party in the United States to the campaign to elect indigenous leader Evo Morales in Bolivia, modern populist movements command international attention and compel political and social change. When citizens demand "power to the people," they evoke corrupt politicians, imperialists, or oligarchies that have appropriated power from its legitimate owners. These stereotypical narratives belie the vague and often contradictory definitions of the concept of "the people" and the many motives of those who use populism as a political tool. In The Promise and Perils of Populism, Carlos de la Torre assembles a group of international scholars to explore the ambiguous meanings and profound implications of grassroots movements across the globe. These trenchant essays explore how fragile political institutions allow populists to achieve power, while strong institutions confine them to the margins of political systems. Their comparative case...