Internationally recognized anti-war activist Cindy Sheehan is running for Congress as an independent against Iraq War supporter, and Speaker of the House, Nancy Pelosi. I think this is the most interesting congressional race this election.
In order to get on the ballot in California as an independent, she has to collect a massive number of signatures from her district (over 10 thousand) by August 8. She already has over 3,000 more signatures than is required, but it is necessary to get much more than the minimum, because some always get thrown out for various reasons.
She has also been endorsed by Ralph Nader, Matt Gonzalez, Cynthia McKinney, the Green Party and the Peace & Freedom Party. Her campaign website also looks quite good:
http://www.cindyforcongress.org/