# California's 23rd State Assembly district

California's 23rd State Assembly district is one of 80 California State Assembly districts. It is currently represented by Democrat Marc Berman of Menlo Park.

## District profile

As of the 2020 redistricting (which took effect as of the 2022 elections), the district includes Silicon Valley communities, containing multiple notable high-tech companies and parts of the Caltrain corridor, as well as smaller, rural districts along the coast.

## Election results from statewide races

Due to redistricting, the 23rd district has been moved around different parts of the state.
| Year | Office | Results |
| 2022 | Governor | Newsom 74.7 – 25.3% |
| 2022 | Senator | Padilla 76.2 – 23.8% |
| 2021 | Recall | Yes 56.5 – 43.5% |
| 2020 | President | Trump 50.2 – 47.8% |
| 2018 | Governor | Cox 55.8 – 44.2% |
| 2018 | Senator | De Leon 53.3 – 46.7% |
| 2016 | President | Trump 50.8 – 44.0% |
| 2016 | Senator | Harris 53.6 – 46.4% |
| 2014 | Governor | Kashkari 58.3 – 41.7% |
| 2012 | President | Romney 54.7 – 43.5% |
| 2012 | Senator | Emken 55.9 – 44.1% |

## List of assembly members

Due to redistricting, the 23rd district has been moved around different parts of the state.
| Assembly members | Party | Years served | Counties represented | Notes |
| William T. Mears | Republican | January 5, 1885 – January 3, 1887 | Sonoma | |
| George W. Morgan | Democratic | January 3, 1887 – January 7, 1889 | Sonoma | |
| Felix B. Mulgrew | Democratic | January 7, 1889 – January 5, 1891 | Sonoma | |
| Frank J. Murphy | Democratic | January 5, 1891 – January 2, 1893 | Sonoma | |
| James I. Taylor | Republican | January 2, 1893 – January 7, 1895 | Marin | |
| James H. Wilkins | Democratic | January 7, 1895 – January 4, 1897 | Marin | |
| M. Canavan | Republican | January 4, 1897 – January 2, 1899 | Marin | |
| John W. Atherton | Republican | January 2, 1899 – January 5, 1903 | Marin | |
| Frank E. Dunlap | Republican | January 5, 1903 – January 2, 1905 | San Joaquin | |
| Robert Beardslee | Republican | January 2, 1905 – January 2, 1911 | San Joaquin | |
| Elmer H. McGowen | Republican | January 2, 1911 – January 6, 1913 | San Joaquin | |
| James J. Ryan | Republican | January 6, 1913 – January 6, 1919 | San Francisco | |
| Charles J. McColgan | Republican | January 6, 1919 – January 3, 1921 | San Francisco | |
| Joseph F. Burns | Democratic | January 3, 1921 – January 7, 1929 | San Francisco | |
| Joseph P. Gilmore | Republican | January 7, 1929 – January 2, 1933 | San Francisco | |
| William B. Hornblower | Republican | January 2, 1933 – January 2, 1939 | San Francisco | |
| Daniel Gallagher | Democratic | January 2, 1939 – January 7, 1942 | San Francisco | Resigned to become a member of the San Francisco County Board of Supervisors |
| William Clifton Berry | Democratic | January 4, 1943 – May 5, 1954 | San Francisco | Died in office. |
| John A. O'Connell | Democratic | January 3, 1955 – January 7, 1963 | San Francisco | |
| John Francis Foran | Democratic | January 7, 1963 – November 30, 1974 | San Francisco | |
| John Vasconcellos | Democratic | December 2, 1974 – November 30, 1992 | Santa Clara | |
| Dominic L. Cortese | Democratic | December 7, 1992 – December 8, 1995 | Santa Clara | Changed his party affiliation from Democrat to Reform. |
| Dominic L. Cortese | Reform | December 8, 1995 – November 30, 1996 | Santa Clara | Changed his party affiliation from Democrat to Reform. |
| Mike Honda | Democratic | December 2, 1996 – November 30, 2000 | Santa Clara | |
| Manny Diaz | Democratic | December 4, 2000 – November 30, 2004 | Santa Clara | |
| Joe Coto | Democratic | December 6, 2004 – November 30, 2010 | Santa Clara | |
| Nora Campos | Democratic | December 6, 2010 – November 30, 2012 | Santa Clara | |
| Jim Patterson | Republican | December 3, 2012 – November 30, 2022 | Fresno, Tulare | |
| Marc Berman | Democratic | December 5, 2022 – Present | San Mateo, Santa Clara | |

## Contents

* 1992
* 1994
* 1996
* 1998
* 2000
* 2002
* 2004
* 2006
* 2008
* 2010
* 2012
* 2014
* 2016
* 2018
* 2020
* 2022
* 2024

### 2024

2024 California State Assembly election :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Marc Berman (incumbent) | 67,177 | 57.4 |
| | Democratic | Lydia Kou | 23,723 | 20.3 |
| | Republican | Gus Mattamal | 13,290 | 11.4 |
| | Republican | Allan Marson | 12,900 | 11.0 |
| Total votes | Total votes | Total votes | 117,090 | 100.0 |
| General election |||||
| | Democratic | Marc Berman (incumbent) | 115,833 | 59.8 |
| | Democratic | Lydia Kou | 77,949 | 40.2 |
| Total votes | Total votes | Total votes | 193,782 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2022

2022 California State Assembly election :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Marc Berman (incumbent) | 83,533 | 76.3 |
| | Republican | Tim Dec | 26,002 | 23.7 |
| Total votes | Total votes | Total votes | 109,535 | 100.0 |
| General election |||||
| | Democratic | Marc Berman (incumbent) | 124,602 | 73.4 |
| | Republican | Tim Dec | 45,149 | 26.6 |
| Total votes | Total votes | Total votes | 169,751 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

### 2020

2020 California State Assembly election :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Patterson (incumbent) | 101,217 | 100.0% |
| Total votes | Total votes | Total votes | 101,217 | 100.0% |
| General election |||||
| | Republican | Jim Patterson (incumbent) | 177,600 | 100.0% |
| Total votes | Total votes | Total votes | 177,600 | 100.0% |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2018

California State Assembly election, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Patterson (incumbent) | 58,927 | 64.9 |
| | Democratic | Aileen Rizo | 31,902 | 35.1 |
| Total votes | Total votes | Total votes | 90,829 | 100.0 |
| General election |||||
| | Republican | Jim Patterson (incumbent) | 98,789 | 59.4 |
| | Democratic | Aileen Rizo | 67,443 | 40.6 |
| Total votes | Total votes | Total votes | 166,232 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2016

California State Assembly election, 2016 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Patterson (incumbent) | 73,686 | 77.4 |
| | Republican | Gwen L. Morris | 21,522 | 22.6 |
| Total votes | Total votes | Total votes | 95,208 | 100.0 |
| General election |||||
| | Republican | Jim Patterson (incumbent) | 125,123 | 75.9 |
| | Republican | Gwen L. Morris | 39,656 | 24.1 |
| Total votes | Total votes | Total votes | 164,809 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2014

California State Assembly election, 2014 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Patterson (incumbent) | 55,914 | 100.0 |
| Total votes | Total votes | Total votes | 55,914 | 100.0 |
| General election |||||
| | Republican | Jim Patterson (incumbent) | 82,417 | 100.0 |
| Total votes | Total votes | Total votes | 82,417 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

### 2012

California State Assembly election, 2012 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Patterson | 30,827 | 39.4 |
| | Republican | Bob Whalen | 19,992 | 25.5 |
| | Democratic | Richard Rojas | 17,690 | 22.6 |
| | Republican | Vong Mouanoutoua | 5,487 | 7.0 |
| | Republican | David DeFrank | 4,278 | 5.5 |
| Total votes | Total votes | Total votes | 78,274 | 100.0 |
| General election |||||
| | Republican | Jim Patterson | 83,817 | 54.7 |
| | Republican | Bob Whalen | 69,457 | 45.3 |
| Total votes | Total votes | Total votes | 153,274 | 100.0 |
| | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic | Republican gain from Democratic |

### 2010

2010 California State Assembly election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Nora Campos | 58,629 | 75.1 |
| | Republican | Atul Saini | 19,494 | 24.9 |
| Total votes | Total votes | Total votes | 78,123 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2008

2008 California State Assembly election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Joe Coto (incumbent) | 81,523 | 76.62 |
| | Republican | Mark Patrosso | 24,876 | 23.38 |
| Total votes | Total votes | Total votes | 106,399 | 100.00 |
| Turnout | Turnout | Turnout | | 71.12 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2006

2006 California State Assembly election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Joe Coto (incumbent) | 49,977 | 73.88 |
| | Republican | Mark Patrosso | 17,671 | 26.12 |
| Total votes | Total votes | Total votes | 67,648 | 100.00 |
| Turnout | Turnout | Turnout | | 51.58 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2004

2004 California State Assembly election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Joe Coto | 62,569 | 67.12 |
| | Republican | Mark Patrosso | 26,051 | 27.95 |
| | Green | Warner S. Bloomberg IIi | 4,597 | 4.93 |
| Total votes | Total votes | Total votes | 93,217 | 100.00 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2002

2002 California State Assembly election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Manny Diaz (incumbent) | 42,428 | 81.55 |
| | Green | Warner S. Bloomberg III | 9,598 | 18.45 |
| Invalid or blank votes | Invalid or blank votes | Invalid or blank votes | 8,220 | 13.64 |
| Total votes | Total votes | Total votes | 60,246 | 100.00 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 2000

2000 California State Assembly election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Manolo Diaz | 58,020 | 71.60 |
| | Republican | Tom Askeland | 17,531 | 21.64 |
| | Libertarian | Dana W. Albrecht | 5,478 | 6.76 |
| Invalid or blank votes | Invalid or blank votes | Invalid or blank votes | 9,017 | 10.01 |
| Total votes | Total votes | Total votes | 90,046 | 100.00 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1998

1998 California State Assembly election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Honda (incumbent) | 45,340 | 75.77 |
| | Republican | Patrick Du Long | 14,498 | 24.23 |
| Invalid or blank votes | Invalid or blank votes | Invalid or blank votes | 6,125 | 9.29 |
| Total votes | Total votes | Total votes | 65,963 | 100.00 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1996

1996 California State Assembly election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Honda | 54,370 | 73.39 |
| | Republican | Lisa M. Sutton | 19,712 | 26.61 |
| Invalid or blank votes | Invalid or blank votes | Invalid or blank votes | 7,844 | 9.57 |
| Total votes | Total votes | Total votes | 81,926 | 100.00 |
| | Democratic gain from Reform | Democratic gain from Reform | Democratic gain from Reform | Democratic gain from Reform |

### 1994

1994 California State Assembly election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Dominic L. Cortese (incumbent) | 36,575 | 64.33 |
| | Republican | Frank Jewett | 15,647 | 27.52 |
| | Green | Tim K. Fitzgerald | 4,630 | 8.14 |
| Invalid or blank votes | Invalid or blank votes | Invalid or blank votes | 10,009 | 14.97 |
| Total votes | Total votes | Total votes | 66,861 | 100.00 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

### 1992

1992 California State Assembly election :
| Party | Party | Candidate | Votes | % |
| | Democratic | Dominic L. Cortese (incumbent) | 54,539 | 65.91 |
| | Republican | Monica A. Valladares | 28,121 | 34.09 |
| Invalid or blank votes | Invalid or blank votes | Invalid or blank votes | 10,210 | 10.98 |
| Total votes | Total votes | Total votes | 92,870 | 100.00 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |