United States Senate election in California, 2010 General election Polling

| Poll_source | Dates_administered | Sample_size | Margin_of_error | Barbara_Boxer_D | Carly_Fiorina_R | Other | Undecided |
|---|---|---|---|---|---|---|---|
| Survey USA/CBS 5 (report) | August 9–11, 2010 | 602 | ± 4.0% | 42% | 47% | — | 11% |
| Rasmussen Reports (report) | August 3, 2010 | 750 | ± 4.0% | 45% | 40% | 5% | 10% |
| Public Policy Polling (report) | July 23–25, 2010 | 614 | ± 3.95% | 49% | 40% | — | 11% |
| Rasmussen Reports (report) | July 12, 2010 | 500 | ± 4.5% | 49% | 42% | 4% | 5% |
| Survey USA (report) | July 8–11, 2010 | 614 | ± 4.0% | 45% | 47% | 3% | 5% |
| Reuters (report) | June 30, 2010 | 600 | ± 4.5% | 45% | 41% | 1% | 13% |
| Rasmussen Reports (report) | June 9, 2010 | 500 | ± 4.5% | 48% | 43% | 5% | 5% |
| Public Policy Polling (report) | May 21–23, 2010 | 921 | ± 3.2% | 45% | 42% | — | 13% |