A "deep database of every vote in the United States Congress since the 102nd Congress (1991). It lets you browse votes in a variety of ways -- both in aggregate and for individual members of Congress.

The data are assembled from several sources:

• House vote data comes from the Web site of the Clerk of the House of Representatives.
• Senate vote data comes from the Web site of the Senate.
• Member biographical information, including birth dates and hometowns, comes from the Biographical Directory of the United States Congress.
• Member gender information comes from Women in Congress site and the Women in the Senate page.
• Representatives' district information comes from the Library of Congress' THOMAS site.

The site also "offers an RSS feed for every current member of Congress, so you can get notified each time your elected officials vote. Each member-specific feed includes the member's position in the latest 10 votes."