Incumbent Democrat Adam Gray holds a commanding position in California's 13th Congressional District race due to his June 2026 primary victory with 42 percent of the vote, a significant fundraising edge exceeding $4 million compared to Kevin Lincoln's roughly $2.2 million, and redistricting under Proposition 50 that shifted the district toward a Democratic lean despite adding Stockton. Lincoln, the former Stockton mayor and Republican nominee endorsed by President Trump, advanced from a split primary field but trails in forecasts projecting Gray around 60 percent support. Mail voting has begun ahead of the November 3 general election, with Gray benefiting from incumbency and moderate positioning on agriculture and bipartisan issues. Scenarios that could narrow the gap include unusually strong Republican turnout in the Central Valley or late national developments affecting voter sentiment.