This book represents an exciting intellectual meeting of researchers from diverse subfields to analyze how and why uncertainty affects American politics. It seeks to reconnect research traditions that have seldom spoken to one another. Though used by formal theorists, empiricists, and historians in a parallel fashion for a number of years, 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.