Incumbent Democrat Derek Tran defeated Republican Chuong Vo by roughly 21 points in the November 3, 2026, general election for California's 45th House district, with final tallies placing the Democratic margin in the 20-25% range. The outcome aligned with pre-election forecasts rating the seat Likely or Safe Democratic after redistricting produced a modestly favorable map for the party. Tran's substantial fundraising edge, unified support in the top-two primary, and the district's underlying partisan lean—reflected in recent presidential voting—shaped trader expectations for a comfortable victory. Late-counted mail and provisional ballots from Democratic-leaning areas in Los Angeles and Orange counties reinforced the margin without shifting it outside the leading bucket. Certification by December 11 remains the final procedural step, though current counts leave little room for material change.