November 23, 1849
Contested Election Election
Vallejo successfully contested the seat of Senator Jonas Spect (SD-Sonoma).
| SD-Sonoma | |||
| Mariano G. Vallejo | Nonpartisan | Win | |
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 November 23, 1849Contested Election ElectionVallejo successfully contested the seat of Senator Jonas Spect (SD-Sonoma). 
 
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