American Politics
US Congress Roll-call vote, Member Data, Bill, Nomination, Committee, Press Releases (ProPublica API)
Congressional Records, 104th-114th Congress (Library of Congress)
Roll Call Votes, 101st-114th Congress (Office of the Clerk)
DW-NOMINATE score, 1st-113th Congress (Poole and Rosenthal 1997)
Congressional District Data, 78th-105th Congress (Alder 1982)
Congressional District Data, 106th, 109th-114th Congress (US Census Bureau)
US State Legislators and Local Officials (Google Civic API)
US State Legislators Party, Gender, and Racial Composition across States (National Conference of State Legislatures)
Election Statistics, 1920-2014 (Office of the Clerk)
Election Statistics, 1982-2014 (csv format) (Federal Election Commission)
Lobbying Data (Lobby View)
Lobbying Data (OpenSecrets)
Lobbying Disclosure Act Reports (Office of Public Records)
Congressional Districts Shapefiles (US Census Bureau)
TV Advertising Archive (csv format) (Political TV Ad Archive)
International Trade
Trade Flow with HS/HITC Classification (The Observatory Economic Complexity (OEC) API)
Trade Adjustment Assistance Database (US Department of Labor)
Trade Adjustment Assistance Database (Public Citizen)
Imports and Exports by Product and Service, Tariff-Related Information (World Bank)
Antidumping (AD), Global Safeguards (SG), China-Specific Transitional Safeguard (CSG) Measures, and Countervailing Duties (CVD), 1980-2011 (World Bank)
Content of PTAs, Legal Enforceability of Each Provision (279 PTAs), 1958-2015 (World Bank)
European Union
European Paliament Votes and Records (VoteWatch)
European Council Results and Minutes of the Meetings (The European Council)