Use this interactive to track campaign spending by interest groups and political parties in the 2010 midterm elections. Interest group spending increased dramatically in 2010 following a series of Supreme Court rulings on campaign finance, including the landmark Citizens United v. Federal Election Commission.

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Mouse over the map bubbles to learn more. Spending by party: Total • Republicans Total • Democrats

SOURCES: Federal Election Commission filings; Washington Post research



NOTE: Totals represent spending in calendar year 2010 and will change as new filings are made or information is amended. Data includes "electioneering communication" and electronically-filed "independent expenditure" spending reported to the Federal Election Commission. Spending on "issue ads" targeting candidates will not be included if it is more than 30 days before a primary or more than 60 days before the general election. "Weeks on list" shows the total number of weeks that a group or race has been in the top ten throughout the year.



By T.W. Farnam and Nathaniel Vaughn Kelso -- The Washington Post