California State Senate District 34

Tue, Nov 3 · Represented by Tom Umberg Democratic · Member list as of Oct 28Tom Umberg isn’t on the ballot for this seat

Rhonda ShaderRepublican

Last result · 2022 general: Tom Umberg (D) 58.8, Rhonda Shader (R) 41.2

Avelino ValenciaDemocratic4 years since first win

Earlier results: Tom Umberg (Democratic) won by 1.2 points, 2018, older linesJanet Nguyen (Republican) won by 16.1 points, 2014, older linesAll 14 elections

Side by side

Left column: ShaderRight column: Valencia

Donor-based spectrum: LiberalCentristConservativeShaderValencia
Races: Won 0 of 1; Won 1 of 1

How these are counted

The spectrum is a published research score, not our rating. How this works. Wins and losses count the races in our results files, the same as each profile.

Past results

Votes for listed candidates: 164,052
Election day: November 8, 2022
District map: Same as today

California Senate District 34, 1970 to 2022, 2022, every candidate
Candidate	Party	Votes and share	Share
DemocraticTom UmbergWon(incumbent)	Democratic	96,41958.8%	58.8%
RepublicanRhonda Shader	Republican	67,63341.2%	41.2%

Votes for listed candidates: 267,035
Election day: November 6, 2018
District map: Older district map (2012 to 2021)

California Senate District 34, 1970 to 2022, 2018, every candidate
Candidate	Party	Votes and share	Share
DemocraticTom UmbergWon	Democratic	135,06250.6%	50.6%
RepublicanJanet Nguyen(incumbent)	Republican	131,97349.4%	49.4%

Votes for listed candidates: 165,012
Election day: November 4, 2014
District map: Older district map (2012 to 2021)

California Senate District 34, 1970 to 2022, 2014, every candidate
Candidate	Party	Votes and share	Share
RepublicanJanet NguyenWon	Republican	95,79258.0%	58.0%
DemocraticJose Solorio	Democratic	69,22042.0%	42.0%

Votes for listed candidates: 135,269
Election day: November 2, 2010
District map: Older district map (2002 to 2011)

California Senate District 34, 1970 to 2022, 2010, every candidate
Candidate	Party	Votes and share	Share
DemocraticLou CorreaWon(incumbent)	Democratic	88,89265.7%	65.7%
RepublicanLucille Kring	Republican	46,37734.3%	34.3%

1970 to 2022: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), retrieved Oct 28, 2026. Compiled by Carl Klarner (Harvard Dataverse) from official returns; not an official source

Only part of this chamber is up in a given cycle. Which districts vote on which date is not on file. Last contest in this district on file: 2022.

All elections (14 for this seat)

Votes for listed candidates: 164,052
Election day: November 8, 2022
District map: Same as today

California Senate District 34, 1970 to 2022, 2022, every candidate
Candidate	Party	Votes and share	Share
DemocraticTom UmbergWon(incumbent)	Democratic	96,41958.8%	58.8%
RepublicanRhonda Shader	Republican	67,63341.2%	41.2%

Votes for listed candidates: 267,035
Election day: November 6, 2018
District map: Older district map (2012 to 2021)

California Senate District 34, 1970 to 2022, 2018, every candidate
Candidate	Party	Votes and share	Share
DemocraticTom UmbergWon	Democratic	135,06250.6%	50.6%
RepublicanJanet Nguyen(incumbent)	Republican	131,97349.4%	49.4%

Votes for listed candidates: 165,012
Election day: November 4, 2014
District map: Older district map (2012 to 2021)

California Senate District 34, 1970 to 2022, 2014, every candidate
Candidate	Party	Votes and share	Share
RepublicanJanet NguyenWon	Republican	95,79258.0%	58.0%
DemocraticJose Solorio	Democratic	69,22042.0%	42.0%

Votes for listed candidates: 135,269
Election day: November 2, 2010
District map: Older district map (2002 to 2011)

California Senate District 34, 1970 to 2022, 2010, every candidate
Candidate	Party	Votes and share	Share
DemocraticLou CorreaWon(incumbent)	Democratic	88,89265.7%	65.7%
RepublicanLucille Kring	Republican	46,37734.3%	34.3%

California Senate District 34, 1970 to 2022, 2006, every candidate
Candidate	Party	Votes and share	Share
DemocraticLou CorreaWon	Democratic	56,53450.6%	50.6%
RepublicanLynn Daucher	Republican	55,14249.4%	49.4%

Votes for listed candidates: 102,510
Election day: November 5, 2002
District map: Older district map (2002 to 2011)

California Senate District 34, 1970 to 2022, 2002, every candidate
Candidate	Party	Votes and share	Share
DemocraticJoseph DunnWon(incumbent)	Democratic	63,48561.9%	61.9%
RepublicanAraceli Gonzalez	Republican	39,02538.1%	38.1%

Votes for listed candidates: 120,996
Election day: November 3, 1998
District map: Older district map (1992 to 2001)

California Senate District 34, 1970 to 2022, 1998, every candidate
Candidate	Party	Votes and share	Share
DemocraticJoseph DunnWon	Democratic	62,06351.3%	51.3%
RepublicanRob Hurtt(incumbent)	Republican	58,93348.7%	48.7%

Votes for listed candidates: 121,634
Election day: November 8, 1994
District map: Older district map (1992 to 2001)

California Senate District 34, 1970 to 2022, 1994, every candidate
Candidate	Party	Votes and share	Share
RepublicanRob HurttWon	Republican	69,70557.3%	57.3%
DemocraticDonna Chessen	Democratic	44,49936.6%	36.6%
LibertarianThomas E. Reimer	Libertarian	7,4306.1%	6.1%

Votes for listed candidates: 156,301
Election day: November 6, 1990
District map: Older district map (1984 to 1991)

California Senate District 34, 1970 to 2022, 1990, every candidate
Candidate	Party	Votes and share	Share
DemocraticRuben S. AyalaWon(incumbent)	Democratic	80,94951.8%	51.8%
RepublicanCharles Bader	Republican	75,35248.2%	48.2%

Votes for listed candidates: 141,831
Election day: November 4, 1986
District map: Older district map (1984 to 1991)

California Senate District 34, 1970 to 2022, 1986, every candidate
Candidate	Party	Votes and share	Share
DemocraticRuben S. AyalaWon(incumbent)	Democratic	93,41065.9%	65.9%
RepublicanSteve Turner	Republican	48,42134.1%	34.1%

Votes for listed candidates: 152,028
Election day: November 2, 1982
District map: Older district map (1982 to 1983)

California Senate District 34, 1970 to 2022, 1982, every candidate
Candidate	Party	Votes and share	Share
DemocraticRuben S. AyalaWon(incumbent)	Democratic	101,70866.9%	66.9%
RepublicanDean L. Kurtz	Republican	50,32033.1%	33.1%

Votes for listed candidates: 180,954
Election day: November 7, 1978
District map: Older district map (1974 to 1981)

California Senate District 34, 1970 to 2022, 1978, every candidate
Candidate	Party	Votes and share	Share
DemocraticRobert PresleyWon(incumbent)	Democratic	100,74955.7%	55.7%
RepublicanJohn Stanton	Republican	80,20544.3%	44.3%

Votes for listed candidates: 147,740
Election day: November 4, 1974
District map: Older district map (1974 to 1981)

California Senate District 34, 1970 to 2022, 1974, every candidate
Candidate	Party	Votes and share	Share
DemocraticRobert PresleyWon	Democratic	70,84948.0%	48.0%
RepublicanW. Craig Biddle	Republican	70,59747.8%	47.8%
OtherNial D. Meadows	Other	6,2944.3%	4.3%

Votes for listed candidates: 279,586
Election day: November 3, 1970
District map: Older district map (1966 to 1973)

California Senate District 34, 1970 to 2022, 1970, every candidate
Candidate	Party	Votes and share	Share
RepublicanDennis E. CarpenterWon	Republican	189,12167.6%	67.6%
DemocraticDwight W. Mize	Democratic	85,74030.7%	30.7%
OtherJohn W. Ellzey	Other	4,7251.7%	1.7%

More about this race

Open seat

The current holder, Tom Umberg, is not on the candidate list.

Source: elections.cdn.sos.ca.gov (PDF), dated Aug 27

District map

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Official results for California

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Election Wrld. (2026). California State Senate District 34, election results 1970 to 2022. https://www.electionwrld.com/ca/senate/34. Retrieved October 31, 2026.

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Sources

Sources: Census TIGERweb Legislative MapServer (120th CDs layer 0, 119th CDs layer 4, 2026 SLD upper layer 1 and lower layer 2) (US Census Bureau, public domain), retrieved Oct 28, 2026; Open Civic Data division identifiers (census_autogenerated us_sldl/us_sldu and openstates state files); also (sld-recent.json): Open Civic Data division identifiers (country-us) (CC0 (repository); also (sld-recent.json): CC0 1.0), retrieved Oct 28, 2026; Open States people (current) CSVs (CC0-1.0 (Open States people data)), retrieved Oct 28, 2026, compiled by Open States volunteers and staff (rosters from state legislature sites) from official returns, not an official source; State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse) (CC0 1.0), retrieved Oct 28, 2026, compiled by Carl Klarner (Harvard Dataverse) from official returns, not an official source.

DataState data (JSON)Sources: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), DIME (ODC-BY)Data as of Oct 28, 2026