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) | March 10, 2010 | 600 | ± 4.0% | 49% | 40% | — | 11% |
| Rasmussen Reports (report) | February 11, 2010 | 500 | ± 4.5% | 46% | 42% | 7% | 5% |
| PPIC (report) | January 27, 2010 | 2001 | ± 2.0% | 48% | 40% | — | 12% |
| The Field Poll (report) | January 5–17, 2010 | 1005 | ± 3.2% | 50% | 35% | — | 15% |
| Rasmussen Reports (report) | January 14, 2010 | 500 | ± 4.5% | 46% | 43% | 3% | 8% |
| Rasmussen Reports (report) | November 17, 2009 | 500 | ± 4.5% | 46% | 37% | 5% | 12% |
| The Field Poll (report) | Sept. 18–October 6, 2009 | 1005 | ± 3.2% | 49% | 35% | — | 16% |
| Rasmussen Reports (report) | September 23, 2009 | 500 | ± 4.5% | 49% | 39% | 4% | 8% |