Congress gets an 18% approval rating. It appears to be entirely from Democrats and independents upset over Congress' failure to change US policies toward Iraq. From Gallup:
"Americans elected the Democrats as the majority party in Congress in November 2006's midterm election in large part due to frustration with the Iraq war and an ineffective and scandal-plagued Republican-led Congress. But any hopes that the elections would lead to change have not been realized as Democrats' repeated attempts to force a change in Iraq war policy have been largely unsuccessful due to presidential vetoes, disagreements within their own party, and the inability to attract Republican support for their policy proposals. "