California Code, Elections Code - ELEC § 7423

If the elections official, on the 73rd day prior to the presidential primary election, finds that the number of candidates nominated for election to a committee from an Assembly or supervisorial district does not exceed the number of candidates to be elected from that Assembly or supervisorial district, the designation of the office and the names of the candidates shall not be printed on this party's ballot in the Assembly or supervisorial district. In lieu thereof, the board of supervisors shall declare elected the candidates who have been nominated.