. ICPSR maintains and provides access to a vast archive of social science data for research and instruction. Search this site for holdings. Data downloads are free of charge by registering with an Williams email.
The Odum Institute Archive Dataverse contains social science data curated and archived by the Odum Institute Data Archive at the University of North Carolina at Chapel Hill. Some datasets in this collection are restricted to University of North Carolina at Chapel Hill affiliates.
ADA is an independent liberal lobbying organization that archives congressional voting records, applying a Liberal Quotient factor that provides an overall picture of an elected official's political position.
The U.S. Policy Agendas Project collects and organizes data from various archived sources to trace changes in the national policy agenda and public policy outcomes of the United States since the Second World War.