The Movement Toward Socialism (MAS) emerged in Bolivia's Chapare region in the 1990s. Born of a rural social movement of coca growers, it spread to the cities and became the country's dominant political force as its leader, Evo Morales, was elected to the presidency in 2005. This article argues that the MAS is a hybrid organization whose electoral success has been contingent on the construction of a strong rural-urban coalition, built on the basis of different linkages between the MAS and organized popular constituencies in rural and urban areas. Whereas the MAS's rural origins gave rise to grassroots control over the leadership, its expansion to urban areas has fostered the emergence of top-down mobilization strategies. The analysis also reveals how much popular sectors allied with the MAS have pressured the Morales government from below and held it accountable to societal demands.

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This article explores the coalitional success of mass-mobilizing, reformist parties once they achieve power. Why are some of these parties more successful than others at managing the potentially conflicting interests of their diverse social bases? We argue that organizational strategies adopted early on matter greatly. The nature of the party’s core constituency, together with the linkage strategies undertaken by party leaders in crafting a coalition of support, shapes a party’s ability to maintain that coalition over time. When coalitional partners are intensively rather than extensively integrated, they are more likely to compromise over policy disagreements rather than defect when defection becomes attractive. We develop this theory by comparing the evolution of two Bolivian parties: the Revolutionary Nationalist Movement and the Movement Toward Socialism. Against conventional explanations that are overly dependent upon structural factors, our argument stresses the impact of strategic choices in shaping a party’s ability to maintain its coalition.