
March 2000 Primary Election, U.S. Senate: San Joaquin County
| Candidate | Party | County total | Percent, party | Percent, total |
| Diane Feinstein | Dem-Inc | 54596 | 94.1% | 47.2% |
| Michael Schmier | Dem | 3473 | 5.9% | 3.0% |
| Ray Haynes | Rep | 13407 | 25.4% | 11.6% |
| John M. Brown | Rep | 1258 | 2.3% | 1.1% |
| Linh Dao | Rep | 950 | 1.7% | 0.9% |
| Tom Campbell | Rep | 28013 | 52.9% | 24.2% |
| Bill Horn | Rep | 8501 | 16.1% | 7.4% |
| James Peter Gough | Rep | 853 | 1.6% | 0.8% |
| Diane Beall Templin | AI | 646 | 100.0% | 0.5% |
| Jan B. Tucker | Grn | 373 | 44.6% | 0.3% |
| Medea Susan Benjamin | Grn | 463 | 55.4% | 0.3% |
| Gail Katherine Lightfoot | Lib | 1861 | 100.0% | 1.7% |
| Brian M. Rees | NL | 333 | 100.0% | 0.2% |
| Jose Luis Camahort | Ref | 845 | 79.2% | 0.7% |
| Valli Sharpe-Geisler | Ref | 223 | 20.8% | 0.1% |
| Votes not Cast in Race | NA | 6890 | NA | 5.62% |
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Election: U.S. Senate
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