Representing researchers from diverse subfields who analyze how and why uncertainty affects American politics, this study reconnects research traditions that have seldom related to one another. Though used by formal theorists, empiricists, and historians in a parallel fashion, the notion of uncertainty has often been introduced only to explain away anomalies, provide backing for a larger argument, or justify a particular methodology. Uncertainty has rarely been considered in its own right or as a concept that might connect researchers from different subfields.