United States Senate election in Pennsylvania, 2010 General election Polling

| Poll_source | Dates_administered | Sample_size | Margin_of_error | Joe_Sestak_D | Pat_Toomey_R | Other | Undecided |
|---|---|---|---|---|---|---|---|
| Research 2000 (report) | May 7, 2009 | 600 | ± 4.0% | 37% | 32% | –– | –– |
| Quinnipiac University (report) | May 20, 2009 | 1191 | ± 2.8% | 37% | 35% | 1% | 23% |
| Rasmussen Reports (report) | June 16, 2009 | 800 | ± 4.5% | 41% | 35% | 7% | 18% |
| Quinnipiac University (report) | July 19, 2009 | 1173 | ± 2.9% | 35% | 39% | 1% | 23% |
| Rasmussen Reports (report) | August 11, 2009 | 1000 | ± 3.0% | 35% | 43% | 5% | 18% |
| Research 2000 (report) | August 12, 2009 | 600 | ± 5.0% | 42% | 41% | –– | 17% |
| Quinnipiac University (report) | September 28, 2009 | 1100 | ± 3.0% | 35% | 38% | 1% | 25% |