Democracy Corps recently conducted surveys in key battleground districts for 2008 "and the results look like a rerun of 2006 -- an election when Democrats lost no incumbents and swept the competitive seats."
Key findings:
* In the battleground of the 70 most competitive congressional districts (35 Democratic and 35 Republican-held), the Democratic incumbents, including the big class of freshmen, have quickly moved into dramatic leads in the named congressional ballot (52% to 40%.)
* In the 35 Republican battleground districts, the named Republicans trail their generic Democratic opponent by 5 points, 49% to 44%.
* In a poll across seven Republican-held U.S. Senate seats, the named U.S. Senators had a vote to re-elect of only 37% and were garnering only 44% of the vote against a generic challenger.
* The overall image of the Democratic Party has fallen back from the honeymoon post-election period to essentially where it stood for the whole 2006 election period -- and that has been stable since April. On the other hand, the Republicans have weakened in the current period since April to their lowest thermometer score in the past half century.
http://politicalwire.com/archives/2007/07/31/gop_facing_another_wave.html