In the post-War decades political science in the United States has been animated by two seemingly incompatible aims. On the one hand, the discipline is committed to scientific inquiry interpreted in largely positivist terms. On the other hand, the discipline aspires to generate knowledge that might improve democratic politics. I start by sketching pragmatist interpretations of social and political inquiry, of democratic politics, and of how the two are related. Problems of complexity and visibility emerge as central to those interpretations. I then indicate how Edward Tufte’s theoretical analysis of data graphics and the visual politics of the aids activist group ACT UP offer examples of how it is possible to envision complex social and political phenomena in ways that might sustain a democratic relation between inquiry and politics.