Rep. Brian Bilbray (R-Calif.) has conceded to Democrat Scott Peters in one of the nation's closest — and most expensive — House races.

Bilbray had trailed Peters by just a few hundred votes on election night, but that gap has now expanded to more than 3,700 votes. The San Diego-based district was a top target by both parties and saw a total of $7.3 million in independent expenditures pour in, making it one of the most expensive House races in the country.

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Peters's win means Democrats netted four seats in California, half their total gains in the House.

Peters, a San Diego port commissioner, has been in Washington, D.C., this week for new-member orientation.

Bilbray's concession leaves just four seats undecided. Reps. Mike McIntyre (D-N.C.) and Ron BarberRonald (Ron) Sylvester BarberPrinciples and actions mean more than Jeff Flake’s words Giffords to lawmakers avoiding town halls: 'Have some courage' Ten House seats Dems hope Trump will tilt MORE (D-Ariz.) have narrow leads in their races, Rep. Allen West (R-Fla.) is awaiting a court decision on whether he can force a recount in a race he trails in, and Reps. Charles BoustanyCharles William BoustanyTop Lobbyists 2017: Hired Guns Controversial House Republican gains national attention after filming Auschwitz video Democrats, Republicans must work together to advance health care MORE Jr. (R-La.) and Jeff Landry (R-La.) will face off in an early December runoff election.