Democratic congressional candidate Harley Rouda will challenge incumbent Republican Congressman Dana Rohrabacher this November in an attempt to flip California’s 48th Congressional district from red to blue. Rouda’s competitor, stem cell scientist Hans Kierstead, has conceded the second place spot in California’s “top-two” primary to Rouda, according to Rouda’s Twitter account. The concession comes after a weekslong, and yet still unfinished, vote count by the Orange County Registrar of Voters.