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 |
|---|---|---|---|---|---|---|---|
| Los Angeles Times (report) | May 19–26, 2010 | — | — | 44% | 38% | — | — |
| Research 2000 (report) | May 17–19, 2010 | 600 | ± 4.0% | 48% | 39% | — | — |
| PPIC (report) | May 9–16, 2010 | 2003 | ± 2.0% | 48% | 39% | — | 13% |
| Rasmussen Reports (report) | May 12, 2010 | 500 | ± 4.5% | 45% | 38% | 4% | 12% |
| Rasmussen Reports (report) | April 12, 2010 | 500 | ± 4.5% | 42% | 38% | 7% | 13% |
| PPIC (report) | March 24, 2010 | 2002 | ± 2.0% | 44% | 43% | — | 13% |
| The Field Poll (report) | March 18, 2010 | 748 | ± 3.7% | 45% | 44% | — | 11% |
| Rasmussen Reports (report) | March 11, 2010 | 500 | ± 4.5% | 46% | 40% | 4% | 10% |