We intend to analyze the level of adaptation of the revolutionary left organizations in transitional processes Uruguay, Chile and Argentina. Through the electoral performance of the Uruguayan Frente Amplio, the Communist Party Chilean and Argentine evidenciaremos different integration paths. Where the FA expressed a clear example of adaptation and integration hegemonic permanent, while the Chilean gradual. Turn the PC shows a contraadaptación Argentine and marginal integration into the political system of their country. This will be demonstrated through quantitative voting data and reflection on the subject literature.