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 |
|---|---|---|---|---|---|---|---|
| Research 2000 (report) | August 9–12, 2009 | 600 | ± 4.0% | 52% | 31% | — | 17% |
| Rasmussen Reports (report) | July 22, 2009 | 500 | ± 4.5% | 45% | 41% | 7% | 7% |
| Rasmussen Reports (report) | March 9, 2009 | 500 | ± 4.5% | 47% | 38% | 10% | 5% |
| The Field Poll (report) | Feb. 20–March 1, 2009 | 761 | ± 3.6% | 55% | 25% | — | 20% |