March 2000 Primary Election, U.S. Senate: Mariposa County
| Candidate | Party | County total | Percent, party | Percent, total |
| Diane Feinstein | Dem-Inc | 2509 | 94.2% | 38.3% |
| Michael Schmier | Dem | 156 | 5.8% | 2.4% |
| Ray Haynes | Rep | 720 | 20.7% | 11.0% |
| John M. Brown | Rep | 120 | 3.4% | 1.9% |
| Linh Dao | Rep | 71 | 2.0% | 1.1% |
| Tom Campbell | Rep | 1585 | 45.7% | 24.2% |
| Bill Horn | Rep | 919 | 26.5% | 14.1% |
| James Peter Gough | Rep | 60 | 1.7% | 0.9% |
| Diane Beall Templin | AI | 57 | 100.0% | 0.8% |
| Jan B. Tucker | Grn | 34 | 30.9% | 0.5% |
| Medea Susan Benjamin | Grn | 76 | 69.1% | 1.2% |
| Gail Katherine Lightfoot | Lib | 188 | 100.0% | 2.9% |
| Brian M. Rees | NL | 25 | 100.0% | 0.3% |
| Jose Luis Camahort | Ref | 18 | 48.6% | 0.2% |
| Valli Sharpe-Geisler | Ref | 19 | 51.4 | 0.2% |
| Votes not Cast in Race | NA | 430 | NA | 6.15% |
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Election: U.S. Senate
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