# 2018 California State Senate election

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vte :
The 2018 California State Senate elections were held on Tuesday, November 6, 2018, with the primary election being held on June 5, 2018. Voters in the 20 even-numbered districts of the California State Senate elected their representatives. The elections coincided with the elections of other offices, including for governor and the California State Assembly.
The Democratic Party gained three seats: the 12th, 14th, and 34th districts. These victories provided the Democrats with 29 seats and restored the two-thirds supermajority that they lost after the recall of Democratic state senator Josh Newman in June 2018.

## Predictions

| Source | Ranking | As of |
| Governing | Safe D | October 8, 2018 |

## Overview

2018 California State Senate election Primary election — June 5, 2018 :
| Party | Party | Votes | Percentage | Candidates | Advancing to general | Seats contesting |
| | Democratic | 1,742,492 | 60.72% | 44 | 23 | 20 |
| | Republican | 1,024,099 | 35.68% | 19 | 14 | 14 |
| | No party preference | 52,485 | 1.83% | 3 | 2 | 2 |
| | Libertarian | 50,838 | 1.77% | 4 | 0 | 0 |
| Totals | Totals | 2,869,914 | 100.00% | 70 | 39 | — |
2018 California State Senate election General election — November 6, 2018 :
| Party | Party | Votes | Percentage | Not up | Contested | Before | After | +/– |
| | Democratic | 3,562,527 | 64.94% | 15 | 11 | 26 | 29 | 3 |
| | Republican | 1,742,012 | 31.76% | 5 | 9 | 14 | 11 | 3 |
| | No party preference | 181,191 | 3.30% | 0 | 0 | 0 | 0 | 0 |
| Totals | Totals | 5,485,730 | 100.00% | 20 | 20 | 40 | 40 | — |

## District 2

The 2nd district stretches along the North Coast from the Oregon border in the north to the San Francisco Bay Area in the south. It includes all of Del Norte County, Humboldt County, Lake County, Marin County, Mendocino County, and Trinity County, as well as a majority of Sonoma County. The incumbent was Democrat Mike McGuire, who was elected with 70.0% of the vote in 2014.

### Candidates

* Veronica Jacobi (Democratic), former Santa Rosa city councilwoman and candidate for California's 10th State Assembly district in 2014 and 2016
* Mike McGuire (Democratic), incumbent state senator

### Results

California's 2nd State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike McGuire (incumbent) | 163,723 | 76.2 |
| | Democratic | Veronica "Roni" Jacobi | 51,186 | 23.8 |
| Total votes | Total votes | Total votes | 214,909 | 100.0 |
| General election |||||
| | Democratic | Mike McGuire (incumbent) | 233,688 | 67.2 |
| | Democratic | Veronica "Roni" Jacobi | 114,184 | 32.8 |
| Total votes | Total votes | Total votes | 347,872 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 4

The 4th district encompasses the Sacramento Valley, mainly taking in rural farmland as well as Chico, and the Sacramento metropolitan area, including Carmichael, and parts of Rancho Cordova. The incumbent was Republican Jim Nielsen, who was reelected with 63.7% of the vote in 2014.

### Candidates

* Phillip Kim (Democratic), community organizer and campaign staffer for Bernie Sanders 2016 presidential campaign
* Jim Nielsen (Republican), incumbent state senator
* Michael Worley (Democratic), Chico Area Recreation and Park District board member

### Results

California's 4th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Jim Nielsen (incumbent) | 118,756 | 60.3 |
| | Democratic | Phillip Kim | 42,661 | 21.7 |
| | Democratic | Michael "Mike" Worley | 35,472 | 18.0 |
| Total votes | Total votes | Total votes | 192,889 | 100.0 |
| General election |||||
| | Republican | Jim Nielsen (incumbent) | 190,441 | 57.1 |
| | Democratic | Phillip Kim | 142,817 | 42.9 |
| Total votes | Total votes | Total votes | 333,258 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 6

The 6th district is located in the core of the Sacramento metropolitan area, including the state capital of Sacramento and surrounding suburbs. The incumbent was Democrat Richard Pan, who was elected with 53.8% of the vote in 2014.

### Candidates

* Janine DeRose (Libertarian)
* Eric Frame (no party preference), activist
* Jacob Mason (Democratic), factory worker
* Richard Pan (Democratic), incumbent state senator

### Results

California's 6th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Richard Pan (incumbent) | 109,907 | 65.7 |
| | No party preference | Eric Frame | 22,062 | 13.2 |
| | Libertarian | Janine DeRose | 18,308 | 10.9 |
| | Democratic | Jacob Mason | 16,458 | 9.8 |
| | Republican | Austin Bennett (write-in) | 530 | 0.3 |
| Total votes | Total votes | Total votes | 167,238 | 100.0 |
| General election |||||
| | Democratic | Richard Pan (incumbent) | 212,903 | 69.5 |
| | No party preference | Eric Frame | 93,217 | 30.5 |
| Total votes | Total votes | Total votes | 306,120 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 8

The 8th district stretches from the Sacramento suburbs to Death Valley. It encompasses most of the southern Sierra Nevada, Gold Country, and parts of the Central Valley, including parts of Fresno, Clovis, and Turlock. The incumbent was Republican Tom Berryhill, who was term-limited and could not run for reelection.

### Candidates

* Mark Belden (no party preference), businessman
* Andreas Borgeas (Republican), Fresno County supervisor
* Paulina Miranda (Democratic), businesswoman and nominee for California's 8th State Senate district in 2014
* Tom Pratt (Democratic), Vallecito Union School board member and insurance agent

### Results

California's 8th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Andreas Borgeas | 117,673 | 59.4 |
| | Democratic | Paulina Miranda | 42,044 | 21.2 |
| | Democratic | Tom Pratt | 30,984 | 15.6 |
| | No party preference | Mark Belden | 7,304 | 3.7 |
| Total votes | Total votes | Total votes | 198,005 | 100.0 |
| General election |||||
| | Republican | Andreas Borgeas | 202,741 | 59.6 |
| | Democratic | Paulina Miranda | 137,311 | 40.4 |
| Total votes | Total votes | Total votes | 340,052 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 10

The 10th district is located in the southern coastal East Bay and parts of Silicon Valley, including Hayward and Milpitas. The incumbent was Democrat Bob Wieckowski, who was elected with 68.0% of the vote in 2014.

### Candidates

* Victor G. San Vicente (Republican), real estate and mortgage broker
* Ali Sarsack (Libertarian), military veteran and design engineer
* Bob Wieckowski (Democratic), incumbent state senator

### Results

California's 10th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Bob Wieckowski (incumbent) | 102,122 | 71.5 |
| | Republican | Victor G. San Vicente | 34,357 | 24.0 |
| | Libertarian | Ali Sarsak | 6,420 | 4.5 |
| Total votes | Total votes | Total votes | 142,899 | 100.0 |
| General election |||||
| | Democratic | Bob Wieckowski (incumbent) | 205,239 | 75.6 |
| | Republican | Victor G. San Vicente | 66,156 | 24.4 |
| Total votes | Total votes | Total votes | 271,395 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 12

The 12th district takes in the Salinas Valley and a swath of the Central Valley between Modesto and Fresno. The incumbent was Republican Anthony Cannella, who was term-limited and could not run for reelection.

### Candidates

* Anna Caballero (Democratic), state assemblywoman for California's 30th State Assembly district, former Salinas mayor and city councilwoman
* Daniel Parra (Democratic), candidate for California's 21st congressional district in 2016
* Rob Poythress (Republican), Madera County supervisor and former Madera mayor and city councilman
* Johnny Tacherra (Republican), nominee for California's 16th congressional district in 2014 and 2016

### Results

California's 12th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Anna Caballero | 46,970 | 43.3 |
| | Republican | Rob Poythress | 28,512 | 26.3 |
| | Republican | Johnny Tacherra | 24,088 | 22.2 |
| | Democratic | Daniel Parra | 8,740 | 8.1 |
| | Democratic | Dennis J. Brazil (write-in) | 208 | 0.2 |
| Total votes | Total votes | Total votes | 108,518 | 100.0 |
| General election |||||
| | Democratic | Anna Caballero | 110,386 | 54.4 |
| | Republican | Rob Poythress | 92,691 | 45.6 |
| Total votes | Total votes | Total votes | 203,077 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

## District 14

The 14th district takes in parts of the southern Central Valley. It takes in heavily Latino portions of Fresno and Bakersfield, along with Delano, Hanford, and Porterville. The incumbent was Republican Andy Vidak, who was reelected with 54.1% of the vote in 2014.

### Candidates

* Melissa Hurtado (Democratic), Sanger city councilwoman
* Ruben Macareno (Democratic), former chairman of Tulare County Democratic Central Committee
* Abigail Solis (Democratic), Earlimart School District trustee
* Andy Vidak (Republican), incumbent state senator

### Results

California's 14th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Andy Vidak (incumbent) | 37,918 | 54.1 |
| | Democratic | Melissa Hurtado | 16,295 | 23.2 |
| | Democratic | Abigail Solis | 10,413 | 14.9 |
| | Democratic | Ruben Macareno | 5,464 | 7.8 |
| Total votes | Total votes | Total votes | 70,090 | 100.0 |
| General election |||||
| | Democratic | Melissa Hurtado | 80,942 | 55.8 |
| | Republican | Andy Vidak (incumbent) | 64,131 | 44.2 |
| Total votes | Total votes | Total votes | 145,073 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

## District 16

The 16th district consists of the southeastern Central Valley and the High Desert. Much of the population is in the western parts of the district in the Central Valley, anchored by Bakersfield and Visalia, while the desert regions in the eastern half consist of scattered settlements, such as Barstow and Yucca Valley. The incumbent was Republican minority Senate leader Jean Fuller, who was term-limited and could not run for reelection.

### Candidates

* Shannon Grove (Republican), former state assemblywoman for California's 34th State Assembly district
* Ruth Musser-Lopez (Democratic), archaeologist, former Needles city councilwoman, and nominee for California's 16th State Senate district in 2014
* Gregory Tatum (Republican), church pastor

### Results

California's 16th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Shannon Grove | 90,353 | 59.1 |
| | Democratic | Ruth Musser-Lopez | 44,303 | 29.0 |
| | Republican | Gregory Tatum | 18,152 | 11.9 |
| Total votes | Total votes | Total votes | 152,808 | 100.0 |
| General election |||||
| | Republican | Shannon Grove | 169,714 | 64.2 |
| | Democratic | Ruth Musser-Lopez | 94,579 | 35.8 |
| Total votes | Total votes | Total votes | 264,293 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 18

The 18th district consists of the eastern San Fernando Valley, including parts of Burbank, as well as the Los Angeles neighborhoods of Northridge, Sherman Oaks, and Van Nuys. The incumbent was Democrat Robert Hertzberg, who was elected with 70.2% of the vote in 2014.

### Candidates

* Robert Hertzberg (Democratic), incumbent state senator
* Rudy Melendez (Republican)
* Brandon Saario (Republican)
* Roger James Sayegh (Democratic)

### Results

California's 18th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Robert Hertzberg (incumbent) | 72,462 | 66.3 |
| | Republican | Rudy Melendez | 12,564 | 11.5 |
| | Democratic | Roger James Sayegh | 12,238 | 11.2 |
| | Republican | Brandon Saario | 12,048 | 11.0 |
| Total votes | Total votes | Total votes | 109,312 | 100.0 |
| General election |||||
| | Democratic | Robert Hertzberg (incumbent) | 195,623 | 78.1 |
| | Republican | Rudy Melendez | 54,888 | 21.9 |
| Total votes | Total votes | Total votes | 250,511 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 20

The 20th district encompasses parts of the Inland Empire, including Chino, Fontana, Ontario, and parts of San Bernardino. The incumbent was Democrat Connie Leyva, who was elected with 62.4% of the vote in 2014.

### Candidates

* Paul Vincent Avila (Democratic), former Ontario city councilman
* Connie Leyva (Democratic), incumbent state senator
* Matthew Munson (Republican), inventory processor and nominee for California's 20th State Senate district in 2014

### Results

California's 20th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Connie Leyva (incumbent) | 40,112 | 47.0 |
| | Republican | Matthew Munson | 30,233 | 35.4 |
| | Democratic | Paul Vincent Avila | 14,985 | 17.6 |
| Total votes | Total votes | Total votes | 85,330 | 100.0 |
| General election |||||
| | Democratic | Connie Leyva (incumbent) | 137,748 | 69.5 |
| | Republican | Matthew Munson | 60,578 | 30.5 |
| Total votes | Total votes | Total votes | 198,326 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 22

The 22nd district is located in the southern coastal encompasses the San Gabriel Valley and parts of the foothills. The incumbent was Democrat Ed Hernandez, who was term-limited and could not run for reelection.

### Candidates

* Mike Eng (Democratic), Los Angeles Community College District trustee, former assemblyman for California's 49th State Assembly district, and former mayor of Monterey Park
* Monica Garcia (Democratic), Baldwin Park city councilwoman
* Susan Rubio (Democratic), Baldwin Park city councilwoman
* Ruben Sierra (Democratic), union organizer

### Results

California's 22nd State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Eng | 38,051 | 45.3 |
| | Democratic | Susan Rubio | 22,136 | 26.4 |
| | Democratic | Monica Garcia | 17,404 | 20.7 |
| | Democratic | Ruben Sierra | 6,377 | 7.6 |
| Total votes | Total votes | Total votes | 83,968 | 100.0 |
| General election |||||
| | Democratic | Susan Rubio | 101,936 | 52.3 |
| | Democratic | Mike Eng | 93,018 | 47.7 |
| Total votes | Total votes | Total votes | 194,954 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 24

The 24th district encompasses central Los Angeles and its immediate environs, including East Los Angeles, Eagle Rock, and Koreatown. The incumbent was Democratic State Senate President pro tempore Kevin de León, who was term-limited and could not run for reelection.

### Candidates

* Peter Choi (Democratic), small business owner and nominee for California's 24th State Senate district in 2014
* Maria Elena Durazo (Democratic), co-chair of AFL–CIO's immigration committee and vice-chair of Democratic National Committee

### Results

California's 24th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Maria Elena Durazo | 63,719 | 69.8 |
| | Democratic | Peter Choi | 27,566 | 30.2 |
| Total votes | Total votes | Total votes | 91,285 | 100.0 |
| General election |||||
| | Democratic | Maria Elena Durazo | 139,473 | 66.9 |
| | Democratic | Peter Choi | 69,160 | 33.1 |
| Total votes | Total votes | Total votes | 208,633 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 26

The 26th district is centered around the South Bay and Westside regions. The incumbent was Democrat Ben Allen, who was elected with 60.3% of the vote in 2014.

### Candidates

* Ben Allen (Democratic), incumbent state senator
* Baron Bruno (no party preference), realtor and Libertarian nominee for California's 62nd State Assembly district in 2016
* Mark Matthew Herd (Libertarian), Westwood neighborhood councilman

### Results

California's 26th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Ben Allen (incumbent) | 144,283 | 76.8 |
| | No party preference | Baron Bruno | 23,119 | 12.3 |
| | Libertarian | Mark Matthew Herd | 20,534 | 10.9 |
| Total votes | Total votes | Total votes | 187,936 | 100.0 |
| General election |||||
| | Democratic | Ben Allen (incumbent) | 298,609 | 77.2 |
| | No party preference | Baron Bruno | 87,974 | 22.8 |
| Total votes | Total votes | Total votes | 386,583 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 28

The 28th district is located in eastern Riverside County, including Cathedral City, Murrieta, Palm Springs, and Temecula. The incumbent was Republican Jeff Stone, who was elected with 53.0% of the vote in 2014.

### Candidates

* Anna Nevenic (Democratic), registered nurse, candidate for California's 41st congressional district in 2012, and candidate for California's 28th State Senate district in 2014
* Joy Silver (Democratic), affordable housing advisor
* Jeff Stone (Republican), incumbent state senator

### Results

California's 28th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Jeff Stone (incumbent) | 89,426 | 56.0 |
| | Democratic | Joy Silver | 55,312 | 34.7 |
| | Democratic | Anna Nevenic | 14,826 | 9.3 |
| Total votes | Total votes | Total votes | 159,564 | 100.0 |
| General election |||||
| | Republican | Jeff Stone (incumbent) | 151,020 | 51.6 |
| | Democratic | Joy Silver | 141,792 | 48.4 |
| Total votes | Total votes | Total votes | 292,812 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 30

The 30th district is located in Los Angeles County including Culver City, Ladera Heights, Westmont and the Los Angeles neighborhoods of Crenshaw, Downtown, and Florence. The incumbent was Democrat Holly Mitchell, who was reelected with 68.8% of the vote in 2014.

### Candidates

* Holly Mitchell (Democratic), incumbent state senator

### Results

California's 30th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Holly Mitchell (incumbent) | 93,078 | 100.0 |
| Total votes | Total votes | Total votes | 93,078 | 100.0 |
| General election |||||
| | Democratic | Holly Mitchell (incumbent) | 230,623 | 100.0 |
| Total votes | Total votes | Total votes | 230,623 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 32

The 32nd district takes in the Gateway Cities region in southeastern Los Angeles County, as well as Buena Park. The incumbent was Democrat Tony Mendoza, who was elected with 52.3% of the vote in 2014, resigned following sexual assault allegations. However, he decided to run for election again following his resignation.
Note that the primary was held the same day as the special election to fill a vacancy in the seat. Although most of the candidates in the two contests were the same, the results were very different. Rita Topalian finished first in both races, but different candidates finished in second place. Vanessa Delgado finished in second place in the special election, but third place in the regularly scheduled primary election. She received a similar number of votes in both races, but candidate Bob Archuleta received about 54% more votes in the regularly scheduled election than he did in the special election. The different results have been attributed to the different order in which the candidates were listed on the ballot.

### Candidates

* Bob Archuleta (Democratic), Pico Rivera city councilman
* Rudy Bermudez (Democratic), former assemblyman for California's 56th State Assembly district (2002–2006) and former Norwalk city councilman
* David Castellanos (Democratic)
* Vanessa Delgado (Democratic), mayor of Montebello
* Tony Mendoza (Democratic), former state senator for California's 32nd State Senate district
* Vivian Romero (Democratic), Montebello city councilwoman
* Vicky Santana (Democratic), vice president of Rio Hondo College board
* Ion Sarega (Republican), former candidate for La Mirada city council
* Ali S. Taj (Democratic), Artesia city councilman
* Rita Topalian (Republican), attorney and nominee for California's 57th State Assembly district in 2014 and 2016

### Results

California's 32nd State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Rita Topalian | 28,979 | 24.4 |
| | Democratic | Bob Archuleta | 20,652 | 17.4 |
| | Democratic | Vanessa Delgado (incumbent) | 18,709 | 15.7 |
| | Democratic | Tony Mendoza | 11,917 | 10.0 |
| | Republican | Ion Sarega | 11,577 | 9.7 |
| | Democratic | Vicky Santana | 8,236 | 6.9 |
| | Democratic | Ali S. Taj | 6,349 | 5.3 |
| | Democratic | Vivian Romero | 5,495 | 4.6 |
| | Democratic | Rudy Bermudez | 5,455 | 4.6 |
| | Democratic | David Castellanos | 1,541 | 1.3 |
| Total votes | Total votes | Total votes | 118,910 | 100.0 |
| General election |||||
| | Democratic | Bob Archuleta | 177,054 | 66.9 |
| | Republican | Rita Topalian | 87,520 | 33.1 |
| Total votes | Total votes | Total votes | 264,574 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 34

The 34th district is centered around western Orange County, including parts of Anaheim, as well as Garden Grove and Santa Ana. The district also takes in coastal areas, including parts of Huntington Beach and Long Beach. The incumbent was Republican Janet Nguyen, who was elected with 58.1% of the vote in 2014.

### Candidates

* Akash A. Hawkins (Democratic)
* Janet Nguyen (Republican), incumbent state senator
* Jestin L. Samson (Democratic), local activist
* Tom Umberg (Democratic), former state assemblyman for California's 69th State Assembly district (2004–2006) and California's 72nd State Assembly district (1990–1992)

### Endorsements

U.S. representatives
* Lou Correa, U.S. representative (D-CA-46)
* Ted Lieu, U.S. representative (D-CA-33)
* Adam Schiff, U.S. representative (D-CA-28)
State-level officials
* Tom Daly, California state assemblyman (D-69)
* Betty Yee, state controller of California
Local-level officials
* Jim Adams, Los Angeles/Orange Counties Building & Construction Trades Council representative
* Rand Beers, Asst. U.S. Secretary of State & Deputy Secretary Of Homeland Security
* Louis E. Caldera, former U.S. Secretary of the Army
* Joe Dunn, former California state senator
* Bob Foster, former mayor of Long Beach
* Zeke Hernandez, Rancho Santiago Community College District Board member
* Dan Jacobson, Democratic Foundation Of Orange County chairman
* Betty Karnette, former California Ssate senator
* Paul Koretz, Los Angeles City councilman
* Bill Lockyer, former attorney general of California
* Miguel Pulido, mayor of Santa Ana
* Marti Schrank, former Orange County Democratic Party vice chairwoman

### Results

California's 34th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Janet Nguyen (incumbent) | 82,874 | 58.3 |
| | Democratic | Tom Umberg | 37,360 | 26.3 |
| | Democratic | Jestin L. Samson | 13,231 | 9.3 |
| | Democratic | Akash A. Hawkins | 8,746 | 6.2 |
| Total votes | Total votes | Total votes | 142,211 | 100.0 |
| General election |||||
| | Democratic | Tom Umberg | 135,062 | 50.6 |
| | Republican | Janet Nguyen (incumbent) | 131,973 | 49.4 |
| Total votes | Total votes | Total votes | 267,035 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |
General election results by county :
| County | Nguyen (R) | Nguyen (R) | Umberg (D) | Umberg (D) | Total |
| County | Votes | % | Votes | % | Votes |
| Los Angeles | 13,848 | 45.0% | 16,939 | 55.0% | 30,787 |
| Orange | 118,125 | 50.0% | 118,123 | 50.0% | 236,248 |
| Totals | 131,973 | 49.4% | 135,062 | 50.6% | 267,035 |

## District 36

The 36th district encompasses southern Orange County and the North County region of San Diego County. The incumbent was Republican Patricia Bates, who was elected with 65.7% of the vote in 2014.

### Candidates

* Patricia Bates (Republican), incumbent state senator
* Marggie Castellano (Democratic), businesswoman

### Results

California's 36th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Patricia Bates (incumbent) | 124,966 | 54.4 |
| | Democratic | Marggie Castellano | 104,791 | 45.6 |
| Total votes | Total votes | Total votes | 229,757 | 100.0 |
| General election |||||
| | Republican | Patricia Bates (incumbent) | 203,607 | 51.5 |
| | Democratic | Marggie Castellano | 191,392 | 48.5 |
| Total votes | Total votes | Total votes | 394,999 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 38

The 38th district encompasses the East County and inland region of San Diego County. The incumbent was Republican Joel Anderson, who was term-limited and could not run for reelection.

### Candidates

* Jeff Griffith (Democratic), firefighter and paramedic
* Brian Jones (Republican), Santee city councilman and former state assemblyman for California's 77th State Assembly district (2010–2012) and California's 71st State Assembly district (2012–2016)
* Antonio Salguero (Libertarian)

### Results

California's 38th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Republican | Brian Jones | 114,270 | 57.2 |
| | Democratic | Jeff Griffith | 79,862 | 40.0 |
| | Libertarian | Antonio Salguero | 5,576 | 2.8 |
| Total votes | Total votes | Total votes | 199,708 | 100.0 |
| General election |||||
| | Republican | Brian Jones | 187,345 | 53.0 |
| | Democratic | Jeff Griffith | 166,092 | 47.0 |
| Total votes | Total votes | Total votes | 353,437 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 40

The 40th district runs along the entire border between California and Mexico, taking in rural Imperial County as well as the South Bay region of San Diego County. The incumbent was Democrat Ben Hueso, who was reelected with 54.9% of the vote in 2014.

### Candidates

* Ben Hueso (Democratic), incumbent state senator
* Luis R. Vargas (Republican), former California superior court judge

### Results

California's 40th State Senate district, 2018 :
| Primary election |||||
| Party | Party | Candidate | Votes | % |
| | Democratic | Ben Hueso (incumbent) | 70,649 | 60.1 |
| | Republican | Luis R. Vargas | 46,850 | 39.9 |
| Total votes | Total votes | Total votes | 117,499 | 100.0 |
| General election |||||
| | Democratic | Ben Hueso (incumbent) | 152,896 | 65.9 |
| | Republican | Luis R. Vargas | 79,207 | 34.1 |
| Total votes | Total votes | Total votes | 232,103 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |