Mat McCubbins' Political Science Experimental Lab Data Archive
This page includes a wealth of datasets on the U.S. budget, presidential vetoes, and the Supreme Court. It specializes, however, in datasets on congressional behavior, and contains some very comprehensive data on committee assignments, roll call votes, and congressional biographies.
Charles Stewart's Congressional Data Page
This up-to-date web site includes detailed information on congressional roll call votes and committee assignments.
Keith Poole's NOMINATE Data
This page provides the data used by Poole and Rosenthal in their spatial modeling studies. NOMINATE scores for members of the 1st through the 108th Congresses are available.
Biographies, issue positions, and interest group ratings for federal and state officeholders and candidates throughout the U.S. These folks run the famous National Political Awareness Test (NPAT) and publish the results for all the candidates who respond to it.
The League of Women Voters of California's web service providing detailed information -- vote shares, endorsements, biographies, platforms -- on candidates for federal, state, and local office.
Leip's Atlas of U.S. Presidential Elections
If you need presidential elections data, this is the site for you. David Leip makes votes and turnout available by state, and even (for a fee) by county.
State Level Election Returns
This web site is managed by a fellow named Josh Leinsdorf. He calls himself the Chief Psephologist of the Institute for Election Analysis. However, as far as I can tell, he's the only employee. His philosophies run toward the paranoid, but he's compiled a rather healthy collection of electoral data and links. This page has links to the Secretaries of State of all the fifty states, plus electoral data on Canada, India, and the U.K.
Record of American Democracy (ROAD)
This web site, by Gary King et al, contains electoral and demographic information for the U.S. down to precinct level. It also includes data for GIS imaging.
Lijphardt Election Archive
Lijphart has compiled data sets on elections for various countries. Includes very specific electoral data on U.S., including candidate names and characteristics and county-level returns.
Federal Elections Commission: Federal Elections and Voting Statistics
This is fairly comprehensive collection of electoral data. This page includes information on voter turnout in state and federal elections since 1960, and has recent state level data on presidential and congressional elections, including primaries.
Maps of County-Level Presidential Election Returns, 1840-1984
Professor Scott James at UCLA put together these maps using History Machine, a fairly simple Windows-based GIS program.
Polling and Survey Research
ICPSR Data on Mass Political Behavior and Attitudes
This site provides detailed descriptions of ICPSR datasets on election results, mass public opinion, and political history for the U.S. and many other nations.
A nice, nonpartisan compendium of recent polls on candidates and issues.
Index of Historical Documents
This is a rather comprehensive collection of political texts, from the Magna Carta to the U.S. Constitution to JFK's inaugural address. The Center is a rather conservative group, which is why modern Republicans (Goldwater, Reagan, Gingrich) are somewhat over represented in this index.
Economics and Demographics
Bureau of Economic Analysis
This page includes current and historical U.S. economic indicators. Large datasets can be downloaded if necessary, but one can also look as small sets of tables describing specific indicators. The page provides access to the up-to-date Survey of Current Business.
United Nations Statistics Division
This web site emphasizes vital population indicators while providing some information on world economies and political structures.
Statistical Abstract of the United States
The U.S. Census operates this service, which allows one to view any table in the past six annual Statistical Abstracts in PDF file format.
CIA World Factbook
Convenient data on every country in the world, from their population size to what their flag looks like.
Political News Sources
ABC's The Note
A handy daily guide to what journalists are saying.
This Microsoft-owned site features some of the finest writing on the web. It leans slightly left, but the authors will occassionally write against type.