Rep. David Valadao David Goncalves ValadaoEx-GOP Rep. David Valadao up 11 points over Democrat TJ Cox in California House race: poll Republicans uncomfortably playing defense House Democrats target Midwestern GOP seats MORE (R-Ca.) officially conceded the race to Democrat T.J. Cox in California's 21st District Thursday, a month after the midterm election.

Valadao, who is serving his third term, called T.J. Cox to congratulate him in a race that had initially been called for the incumbent.

"Despite the outcome of this election, we must remain deliberate in our efforts to improve our community," Valadao wrote in his concession statement. "There is always work to be completed and I can't wait to see what else our community can accomplish."

Central Valley Republican @RepDavidValadao officially concedes to Democrat @TJCoxCongress in #CA21, a month after election day pic.twitter.com/bdV5PT1IoZ — Casey Tolan (@caseytolan) December 6, 2018

AP retracted its call for Valadao in late November after a batch of outstanding ballots gave Cox a 506 vote lead. Cox declared victory shortly after.

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Valadao held a 4,400 votes lead on Nov. 6, but that advantage was erased as provisional and mail-in ballots continued to be counted weeks after the midterm elections.

Cox's victory would mean a 40-seat gain for Democrats in the House, with North Carolina's 9th District still to be called amid voter fraud allegations.

Cox, a Democratic businessman, was initially running in California’s 10th District against Rep. Jeff Denham Jeffrey (Jeff) John DenhamBottom line Bottom line Lobbying world MORE (R-Calif.), but the House Democrats’ campaign arm convinced Cox to challenge Valadao instead.