2018Flipped from RepublicanFinal resultsIncumbent defeated
2018 election for California Senate District 34
California State Senate · California
Tom Umberg (D) won with 50.6% of the vote, defeating Janet Nguyen (R) by 1.2 points, a seat Republicans won last time.
Tom UmbergDemocrat · winner
50.6%135,062
Janet NguyenRepublican · incumbent
49.4%131,973
267,035 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET