Politicians and political parties are for the most part limited by habit--they recycle tried-and-true strategies, draw on models from the past, and mimic others in the present. But in rare moments politicians break with routine and try something new.

Drawing on pragmatist theories of social action, Revolutionizing Repertoires sets out to examine what happens when the repertoire of practices available to political actors is dramatically reconfigured. Taking as his case study the development of a distinctively Latin American style of populist mobilization, Robert S. Jansen analyzes...