2010 Senate Elections – Polling and Winner Forecasts by State
| Geography | Candidates (D vs. R) | Dem | Rep | Ind | Mrg | Win % | Rating |
| Alaska | McAdams vs. Miller | 27.5 | 32.1 | 32.5 | I+0.4 | 40% | Toss Up |
| Alabama | Barnes vs. Shelby | 30.1 | 58.2 | – | R+28 | 95% | Strong Rep |
| Arizona | Glassman vs. McCain | 36.6 | 54.5 | – | R+18 | 95% | Strong Rep |
| Arkansas | Lincoln vs. Boozman | 37.6 | 54.9 | – | R+17 | 95% | Strong Rep |
| California | Boxer vs. Fiorina | 49 | 43.9 | – | D+5 | 88% | Lean Dem |
| Colorado | Bennet vs. Buck | 46.5 | 47.9 | – | R+1 | 72% | Toss Up |
| Connecticut | Blumenthal vs. McMahon | 53 | 43.8 | – | D+9 | 94% | Strong Dem |
| Delaware | Coons vs. O’Donnell | 53.4 | 39.1 | – | D+14 | 95% | Strong Dem |
| Florida | Meek vs. Rubio | 19.4 | 45.3 | 30.7 | R+15 | 95% | Strong Rep |
| Georgia | Thurmond vs. Isakson | 34.2 | 56.4 | – | R+22 | 95% | Strong Rep |
| Hawaii | Inouye vs. Cavasso | 59.7 | 34.2 | – | D+26 | 95% | Strong Dem |
| Idaho | Sullivan vs. Crapo | 20.8 | 61.9 | – | R+41 | 95% | Strong Rep |
| Illinois | Giannoulias vs. Kirk | 42 | 43.7 | – | R+2 | 73% | Toss Up |
| Indiana | Ellsworth vs. Coats | 34.7 | 51.6 | – | R+17 | 95% | Strong Rep |
| Iowa | Conlin vs. Grassley | 32.4 | 59.1 | – | R+27 | 95% | Strong Rep |
| Kansas | Johnston vs. Moran | 27.3 | 65.6 | – | R+38 | 95% | Strong Rep |
| Kentucky | Conway vs. Paul | 42 | 50.8 | – | R+9 | 93% | Lean Rep |
| Louisiana | Melancon vs. Vitter | 38.3 | 50.1 | 9.2 | R+12 | 94% | Strong Rep |
| Maryland | Mikulski vs. Wargotz | 56.4 | 36.2 | – | D+20 | 95% | Strong Dem |
| Missouri | Carnahan vs. Blunt | 41.9 | 51.1 | – | R+9 | 91% | Lean Rep |
| Nevada | Reid vs. Angle | 46 | 48.8 | 3.9 | R+3 | 80% | Lean Rep |
| New Hampshire | Hodes vs. Ayotte | 39.2 | 53.4 | – | R+14 | 95% | Strong Rep |
| New York A | Schumer vs. Townsend | 61.4 | 33.4 | – | D+28 | 95% | Strong Dem |
| New York B | Gillibrand vs. DioGuardi | 56.4 | 35 | – | D+21 | 95% | Strong Dem |
| North Carolina | Marshall vs. Burr | 38.1 | 50.4 | – | R+12 | 93% | Lean Rep |
| North Dakota | Potter vs. Hoeven | 26.1 | 69 | – | R+43 | 95% | Strong Rep |
| Ohio | Fisher vs. Portman | 38.2 | 55.8 | 4.8 | R+18 | 95% | Strong Rep |
| Oklahoma | Rogers vs. Coburn | 24.3 | 63.7 | – | R+39 | 95% | Strong Rep |
| Oregon | Wyden vs. Huffman | 54.7 | 37.7 | – | D+17 | 95% | Strong Dem |
| Pennsylvania | Sestak vs. Toomey | 44.7 | 48.7 | – | R+4 | 88% | Lean Rep |
| South Carolina | Greene vs. DeMint | 22.6 | 58.4 | – | R+36 | 95% | Strong Rep |
| Utah | Granato vs. Lee | 30 | 54 | – | R+24 | 95% | Strong Rep |
| Vermont | Leahy vs. Britton | 61.4 | 29.6 | – | D+32 | 95% | Strong Dem |
| Washington | Murray vs. Rossi | 48.6 | 47.9 | – | D+0.7 | 60% | Toss Up |
| West Virginia | Manchin vs. Raese | 49.4 | 46.1 | – | D+3 | 84% | Lean Dem |
| Wisconsin | Feingold vs. Johnson | 45.2 | 52.9 | – | R+8 | 89% | Lean Rep |
