Democrat Harley Rouda was declared the winner in the House race in California’s 48th District on Saturday, adding another seat to the party's majority.

Rouda, a businessman and first-time candidate, unseated longtime Rep. Dana Rohrabacher Dana Tyrone RohrabacherDemocrat Harley Rouda advances in California House primary Lawyers to seek asylum for Assange in France: report Rohrabacher tells Yahoo he discussed pardon with Assange for proof Russia didn't hack DNC email MORE (R-Calif.) in his competitive Orange County district.

The Associated Press called the race Saturday evening after additional mail-in ballots were were counted. ADVERTISEMENT

The GOP congressman was a top Democratic target since he represented one of seven GOP-held seats in California that former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE won in 2016.

The demographic shifts made it a top priority on Democrats’ wish list. Rouda emerged from a hyper-competitive primary with help from national Democrats. Both parties spent millions of dollars on the 48th District as Democrats looked to flip 23 seats to regain the House majority.

Democrats also had a huge target on Rohrabacher’s back given his perceived strong ties to Russia, which has drawn scrutiny from both parties. Rohrabacher has served in Congress for more than 30 years.