Abstract: | How do advocacy organizations make tactical choices? This paper contributes to theory building in advocacy studies by examining how the decision‐making processes of advocacy organizations are affected by the choices of their peers. Drawing on qualitative interviews with practitioners in two contexts—the European Union and the United States—I document that organizations face pressures toward cohesion and differentiation with the tactical choices of other organizations. Other important processes—such as rational evaluation of political opportunities, resource dependence, and ideological constraint—are also reported to be influential, although these processes are sometimes influenced by relational dynamics. These findings suggest new variables and relationships of interest for future quantitative research and provide insight into the growing complexity of climate politics. |