| Arizona | Kyl (R)* 49.3% vs. Pederson (D) 40.7% | Chart | Kyl +8.6% |
| Connecticut | Lieberman (I) 49.8% vs. Lamont (D) 38.0% | Chart | Lieberman +11.8% |
| Maryland | Steele (R) 45.0% vs. Cardin (D) 48.7% | Chart | Cardin +3.7% |
| Michigan | Bouchard (R) 37.8% vs. Stabenow (D)* 52.3% | Chart | Stabenow +14.5% |
| Minnesota | Kennedy (R) 37.4% vs. Klobuchar (D) 54.0% | Chart | Klobuchar +16.6% |
| Missouri | Talent (R)* 45.8% vs. McCaskill (D) 48.3% | Chart | McCaskill +2.5% |
| Montana | Burns (R)* 45.5% vs. Tester (D) 48.5% | Chart | Tester +3.0% |
| New Jersey | Kean (R) 41.8% vs. Menendez (D)* 48.2% | Chart | Menendez +6.4% |
| Ohio | DeWine (R)* 43.3% vs. Brown (D) 53.3% | Chart | Brown +10.0% |
| Pennsylvania | Santorum (R)* 40.8% vs. Casey (D) 52.3% | Chart | Casey +11.5% |
| Rhode Island | Chafee (R) 45.5% vs. Whitehouse (D) 46.5% | Chart | Whitehouse +1.0% |
| Tennessee | Corker (R) 50.3% vs. Ford (D) 44.3% | Chart | Corker +6.0% |
| Virginia | Allen (R)* 46.8% vs. Webb (D) 48.3% | Chart | Webb +1.5% |
| Washington | McGavick (R) 40.5% vs. Cantwell (D)* 53.8% | Chart | Cantwell +13.3% |