Will Republicans take control of the House in 2010? Post reporters Dan Balz and Chris Cillizza will weigh in regularly on the 25 races you need to know about.
Stay on top of the 36 Senate seats up for grabs with exclusive race rankings by The Post's Dan Balz and Chris Cillizza.
Use this tool to view election history, see upcoming primaries and analyze key demographics.
The last three weeks in Wisconsin have proven that what goes on in the states has reverberations across the country.

Take a look at the broad themes of the president's address, how the public views his handling of the issues and which lines got the best response.

The U.S. Congress Votes Database documents every vote and member of the House and Senate since 1991.

18 states have lost or gained seats in the House of Representatives based on 2010 U.S. Census figures. Explore changes over time.

Drill in on the 2010 results for the House, Senate and governors races.

Interviews with nearly 650 organizations revealed a movement that has attracted hundreds of thousands of first-time activists but one that shows little interest in becoming a coordinated political force.

Former Alaska governor Sarah Palin threw her support behind dozens of candidates. Explore her endorsements and see how they fared in the 2010 midterm elections.

Democrats had more money than Republicans in the contests for 63 seats that flipped to the GOP in 2010. But Republicans invested more in their own campaigns and benefited from more interest-group spending.

Only two tea party groups officially endorsed candidates in the 2010 elections at the national level: Freedom Works and Tea Party Express.The Post's interactive map shows how many of their candidates won and how many lost.
Chris Cillizza was online Friday to discuss the week in Washington: "If Palin and Huckabee don't run, I think there is a case to be made that Santorum could emerge as the choice of a segment of social conservatives."
Browse every vote in the U.S. Congress since 1991, or search the database to see how your member voted on a particular measure.
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