Democrats have gained 40 House seats, as NBC News on Thursday declared TJ Cox the apparent winner in California’s 21 District.

Incumbent Republican Rep. David Valadao conceded on Thursday afternoon, following weeks of ballot counting in the tight race. With 100 percent of ballots tallied, Cox had 50.4 percent of the vote; Valadao trailed by 862 votes, according to NBC News.

Cox declared victory on Nov. 28th, when he lead by more than 500 votes.