Who Will Win California’s 48th Congressional District House Seat

California voters head to the polls in November to decide statewide and local races alongside 14 ballot propositions, including a closely watched "billionaires tax" measure and a recall-process reform. San Diego County's voter guide outlines a packed slate of contests, with voter pamphlets mailed in late September and ballots beginning to arrive October 5.

Key federal races include five competitive U.S. House districts (48–52), pitting incumbents and challengers from both parties after redistricting reshaped several seats. State Senate and Assembly races feature multiple incumbents defending seats, while the California State Board of Equalization's District 4 race pits a local water official against a sitting state senator.

Locally, San Diego County voters will also choose county supervisors, school board members, and city officials across numerous municipalities including San Diego, Chula Vista, Carlsbad, Escondido, Oceanside, and others, alongside mayoral races and special district seats covering healthcare, water, and community college boards. The wide-ranging ballot reflects a highly competitive election cycle across Southern California.

San Diego County voters face three measures this Election Day. Measure A would amend the county charter to create an independent ethics commission, add independent budget and program auditor roles, and raise supervisor term limits from two to three four-year terms, retroactively benefiting current board members. Measure B would impose a 0.5% countywide sales tax, directed mostly toward healthcare, nutrition, and family services, with a smaller share for Tijuana River Valley sewage cleanup and public safety, raising an estimated $400–450 million annually. Measure M authorizes a $3.5 billion school bond for San Diego Unified facility repairs without raising property tax rates, requiring 55% voter approval to pass.

California's Supreme Court unanimously ruled that Riverside County Sheriff Chad Bianco broke state election law when he seized more than 650,000 ballots from the county's registrar of voters earlier this year, and broke it again by defying Attorney General Rob Bonta's order to reverse course. Chief Justice Patricia Guerrero wrote that state law mandates ballots remain in the custody of election officials, rejecting Bianco's argument that a search warrant justified the seizure. The court ordered Bianco to return the ballots and end his investigation pending review by Bonta's office. A second ruling affirmed the attorney general's constitutional authority to directly supervise sheriffs, rejecting Bianco's claim that such oversight is merely advisory.

Bianco seized the ballots after a November 2025 special election on redistricting, spurred by activists alleging discrepancies later attributed to misread preliminary data. In response, California enacted two new laws making it a felony to seize ballots or voting machines before certification. Bianco has said his investigation will continue regardless of the ruling.

San Diego County election officials say voting is proceeding securely and on pace with typical midterm turnout, with tens of thousands of ballots already cast three weeks before Election Day. County Registrar of Voters Shawn Brom said the system remains safe and accessible for both mail-in and in-person voting at designated centers.

The reassurance comes amid broader tension between state and federal officials over election administration. California Attorney General Rob Bonta said his office sued the Trump administration after it attempted to restrict mail-in voting weeks before the election, and the Supreme Court subsequently ruled against that effort. Bonta said he expects the election to proceed without federal interference. The Trump administration has said it does not plan to deploy ICE agents at polling sites. San Diego County officials noted they are coordinating with local law enforcement to address voter intimidation and other potential irregularities, aiming to ensure the midterm election remains fair and free of disruption.

San Diego County's Registrar of Voters is encouraging residents to vote early for the November general election. Officials sent 1.8 million reminder postcards to voters who had not yet returned ballots as of Oct. 16. Early voting helps speed ballot processing for election night results and reduces lines at in-person vote centers, which open in phases, with some opening Saturday and the rest on Oct. 31.

Voters can return ballots by mail, at any of more than 150 drop boxes countywide, or at vote centers starting Saturday. Mailed ballots must be postmarked by Nov. 3 and received by Nov. 10. Drop box and vote center ballots are due by 8 p.m. on Election Day.

Gov. Gavin Newsom has signed a batch of housing bills aimed at speeding up residential construction, though most are expected to have a modest effect in San Diego, often considered an easier place to build than other parts of California. Among the changes: lower impact fees for accessory dwelling units (ADUs) over 750 square feet (SB 1117); narrower rules easing construction of for-sale townhouses on vacant single-family lots (SB 1116, AB 1751); a requirement for large cities like San Diego to designate high-density "transit-hub districts" allowing taller buildings near transit (AB 2074); and a mandate for cities to provide upfront, non-binding infrastructure fee estimates to developers (SB 1014).

The most consequential local legislation, SB 344 and SB 958, clears environmental and height-related legal hurdles for the Midway Rising megaproject, which could break ground next year. Plans include a 16,000-seat arena and 4,254 apartments — a regional record — with roughly 2,000 designated as subsidized housing, far surpassing the county's current largest affordable complex.

Encinitas is pursuing an agreement with the San Diego Rescue Mission to reserve up to 12 beds for its homeless residents at the South County Lighthouse shelter in National City, more than 30 miles away. The Encinitas City Council voted unanimously on Sept. 16 to pursue the deal after Vista signaled it wants full use of the Buena Creek Navigation Center, a shelter the two North County cities had shared since 2024. Encinitas Mayor Bruce Ehlers called the arrangement more financially responsible than the roughly $715,000 the city spent on its previous Vista beds, and said it is meant to be temporary until more North County shelter capacity exists.

National City Councilmember Jose Rodriguez opposes the plan, arguing wealthier Encinitas is shifting responsibility onto a financially strained community. National City Mayor Ron Morrison is less concerned, noting the 162-bed shelter already serves a regional population, including about 30 Encinitas residents over the past year. The Rescue Mission says it hopes to open a new Escondido shelter that would eventually absorb the reserved beds. The dispute reflects broader tension over how San Diego County communities share homelessness costs and resources.

San Diego County's Board of Supervisors voted 3-2 along party lines to end agreements allowing ICE and CBP to train at the county-owned San Diego Regional Firearms Training Center in Otay Mesa. Supervisors Paloma Aguirre, Terra Lawson-Remer and Monica Montgomery Steppe backed the move, citing eroded community trust amid the Trump administration's immigration crackdown; the agenda item cited more than 16,000 removals from the county since January 2025 and at least 41 shootings involving federal immigration agents, with 11 fatalities.

Sheriff Kelly Martinez, who supports removing ICE, said she will still let CBP use the range, arguing its border and airport operations differ from ICE's enforcement mission and that cutting access would worsen wait times at ports of entry. CBP, the Sheriff's Department and the local chamber of commerce warned of economic fallout, while the supervisors who authored the motion countered that border delays are a federal responsibility, not a reason to keep training agents linked to the deportation campaign. The agreements, dating to 2021 and worth roughly $10,000 (ICE) and $117,000 (CBP) annually, only became public after a local news investigation. A similar dispute in Escondido ended with that city keeping ICE's access.