Influence Explorer: Data on campaign finance, sourced and organized from the Federal Election Commission. API allows for submission of complicated queries.
Voter Information Services (VIS): a non-partisan resource that provides information on the effects of federal laws enacted by the U.S. Congress and the role of individual members of Congress in the legislative process.
CQ Weekly Report: Provides weekly (pre- and post-) editions on information such as final vote tallies, campaign spending, challenger quality and other analytical reports.
Legislative Studies: A platform for those interested in legislative processes, behavior, and representation opportunities to meet and exchange ideas.
C. Lawrence Evans Data: the first release of the Congressional Whip Count Database, which provides extensive data about the whip polls conducted by party leaders in the U.S. House prior to major roll call votes on the floor, 1955-86.
The White House Briefing Room: Official site for timely and accurate U.S. presidential events, public statements, legislations and disclosures.
Ethics Data: U.S. federal government website with data on such topics as campaign finance, lobbying, and White House visitor logs.
The Supreme Court Database: data and analysis on natural courts tracing back to 1953.
Supreme Court Opinions: supreme court opionion writing database.
Judicial Elections Data Initiative (JEDI): data on elections to state courts of last resort from 1990 to 2010.
Pew Center on the States: provides nonpartisan reporting and research, advocacy, and technical assistance to help states deliver better results and achieve long-term fiscal health by investing in programs that provide the strongest returns.
Yale Institution for Social and Policy Studies (ISPS): a platform facilitating interdisciplinary inquiry in the social sciences and research into important public policy arenas. Provides replication data for all studies conducted by ISPS-affiliated researchers.
Policy Agendas Project: collects and organizes data from various archived sources to trace changes in the national policy agenda and public policy outcomes since the Second World War.
National Governors Association (NGA): data on how US governors are collectively identifying issues concerning state and national policy.
Vanderbilt TV News Archive: archive of television news from US national television networks.