According to BENAWAU''s latest post, all of this this would now mean that Democrats have 412 districts challenged. This is a fantastic total, nine seats better than the recent Democratic record of 403, and surpassing every recent total by every party except Republicans in 1994. Better yet, I think only four seats, AL-06, CA-42, MS-03, and TX-11 will definitely not have a Democratic challenger. That means we could still reach 431, smashing the recent all-party record of 419 districts set by Republicans in 1994.
http://www.dailykos.com/storyonly/2006/4/10/174554/515