Why has Mexico's political left been in such turmoil since the dramatic 2006 election? What explains the contentious relationship between the country's largest left-wing party, the PRD, and its former presidential candidate Andrés Manuel López Obrador? Is the PRD in fact a political party, or instead a much looser political movement? Dag Mossige provides an insightful exploration of the inner workings of the PRD and its seemingly unending internal wars.