In reading the essays by David M. Trubek and John Esser and Boaventura de Sousa Santos, I thought about what I call epistemological moments that have provided contexts within which to understand the relationship between social science research and politics. I will sketch four moments and suggest that I find one of them more compelling than the others because it speaks particularly to social scientists with critical, democratic ambitions and to Trubek and Esser's concerns about politics and the intellectual vitality of the law and society movement.