The Winner
Rep. Mark DeSaulnier (D) won California's 10th U.S. House District race on Nov. 3, according to the Associated Press, which called the race at 8:42 p.m. PT that night. DeSaulnier won re-election, keeping the seat in Democratic hands.
In the June 2026 top-two primary, DeSaulnier drew about 132,246 votes, roughly 59.7 percent of the roughly 221,581 cast, according to AllCiv.
DeSaulnier is the Democratic incumbent, having held the seat since at least the 2024 race. His general election opponent was Jeff Frese, the Republican who advanced through the June top-two primary with about 12.9 percent of the vote, or about 28,671 votes.
General election vote totals for the Nov. 3 contest had not been reported as of the race record's build date, so a final breakdown between the two candidates is not yet available.
The Race
Cook Political Report rated the seat Solid D, Inside Elections rated it Solid Democratic, and Sabato's Crystal Ball rated it Safe Democratic.
All outside spending recorded in the race went toward supporting DeSaulnier; no outside money opposing him was on file as of Nov. 4.
According to Geographies, California's 10th Congressional District has a total population of about 760,300, a median household income of about $153,500, a median age of about 41.1 years, and roughly 55.6 percent of adults hold a bachelor's degree or higher.
What's Next
California's general election results are scheduled to be certified by the California Secretary of State on Dec. 11, and DeSaulnier is set to take office on Jan. 3, 2027.
DeSaulnier has said he is focused on transportation solutions, including electric-vehicle infrastructure and public transit, and authored provisions advancing those priorities that passed the House Transportation and Infrastructure Committee in May 2026, according to a May 22, 2026 press release from Congressman Mark DeSaulnier.
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