On Congressional Races—Charlie Cook reclassified several races when Obama took the nomination:

Changes made about a week ago. Shays and Kirk are the obvious ones where Obama pulls out voters in their district and they are likely to get knocked off.

CA-04                     OPEN (Doolittle)      Solid Republican to Likely Republican

CO-04                     Marilyn Musgrave   Lean Republican to Toss Up

CT-04                     Chris Shays               Lean Republican to Toss Up

IL-10                       Mark Kirk                 Lean Republican to Toss Up

NM-02                    OPEN (Pearce)         Likely Republican to Lean Republican

NY-29                     Randy Kuhl               Lean Republican to Toss Up

NC-08                     Robin Hayes              Lean Republican to Toss Up

OH-01                     Steve Chabot             Lean Republican to Toss Up

VA-02                     Thelma Drake           Likely Republican to Lean Republican

WA-08                    Dave Reichert           Lean Republican to Toss Up