United States Senate election in California, 2010 Republican primary Polling

| Poll_source | Dates_administered | Sample_size | Margin_of_Error | Tom_Campbell | Carly_Fiorina | Chuck_DeVore | Other | Unde_cided |
|---|---|---|---|---|---|---|---|---|
| Survey USA (report) | June 3–6, 2010 | 569 | ±4.2% | 22% | 48% | 16% | 9% | 9% |
| Los Angeles Times (report) | May 19–26, 2010 | 1506 | ±2.6% | 23% | 38% | 16% | 23% | 23% |
| Survey USA (report) | May 21–23, 2010 | 612 | ±4.3% | 23% | 46% | 14% | 6% | 11% |
| Public Policy Polling (report) | May 21–23, 2010 | 417 | ±4.8% | 21% | 41% | 16% | — | 18% |
| PPIC (report) | May 9–16, 2010 | 1168 | ±3.0% | 23% | 25% | 16% | — | 36% |
| Research 2000 (report) | May 17–19, 2010 | 400 | ±5.0% | 37% | 22% | 14% | — | 27% |
| Survey USA (report) | May 6–9, 2010 | 548 | ±4.3% | 35% | 24% | 15% | 3% | 23% |