Voters in the 51st Congressional District, which includes the Imperial Valley, chose Democrat Bob Filner and Republican Maria Guadalupe Garcia to face off in the November runoff.
They will be joined by Libertarian Jeffrey S. Keup.
Filner, who resides in San Diego and is the 51st District congressman, received 22,608 votes, or 70 percent of the votes cast. His Democratic primary challenger, Calexico resident Daniel Ramirez, received 9,692 votes, or 30 percent.
For the Republicans, Garcia, who resides in Chula Vista, garnered 10,257 votes, or 53 percent while Guillermo Durazo, also of Chula Vista, received 9,187 votes, or 47 percent.