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) | April 19–21, 2010 | 538 | ±4.3% | 34% | 27% | 14% | 3% | 23% |
| Los Angeles Times (report) | March 23–30, 2010 | 1515 | ±2.6% | 29% | 25% | 9% | 4% | 33% |
| PPIC (report) | March 24, 2010 | 2002 | ±2.0% | 23% | 24% | 8% | 1% | 44% |
| Research 2000 (report) | March 10, 2010 | 400 | ±5.0% | 33% | 24% | 7% | — | 36% |
| M4 Strategies (report) | February 26, 2010 | 427 | — | 32% | 19% | 11% | — | 39% |
| PPIC (report) | January 27, 2010 | 2001 | ±2.0% | 27% | 16% | 8% | 1% | 48% |
| The Field Poll (report) | January 5–17, 2010 | 202 | ±7.1% | 30% | 25% | 6% | — | 39% |
| Los Angeles Times (report) | Oct. 27–November 3, 2009 | 499 | — | — | 27% | 27% | 2% | 40% |