Charlie Cook: "Barring a dramatic event, we are looking at the prospect of GOP losses in the House of at least 20 to 35 seats, possibly more, and at least four in the Senate, with five or six most likely." Cook's latest ratings changes:

AZ-05 (Hayworth) Lean Republican to Toss Up CA-11 (Pombo) Lean Republican to Toss Up CO-04 (Musgrave) Lean Republican to Toss Up CO-05 (Open) Likely Rep. to Lean Rep. IA-01 (Open) Toss Up to Lean Democratic KS-02 (Ryun) Likely Republican to Toss Up MN-01 (Gutknecht) Lean Republican to Toss Up NE-03 (Open) Likely Rep. to Lean Rep. NH-02 (Bass) Lean Republican to Toss Up OH-02 (Schmidt) Lean Republican to Toss Up WY-AL (Cubin) Lean Republican to Toss Up CA-50 (Bilbray) Likely Rep. to Lean Rep

Every one of those changes favors Dems. "Just a few weeks ago," Cook writes, "most of these newly added contests were either considered long-shots or weren’t even on the radar screen."