Cal. Elections Code § 8121

(a) Not less than five days before he or she transmits the certified list of candidates to the county elections officials, as provided in Section 8120, the Secretary of State shall notify each candidate for partisan office and voter-nominated office of the names, addresses, offices, occupations, and party preferences of all other persons who have filed for the same office. (b) (1) Beginning not less than five days before he or she transmits the certified list of candidates to the county elections officials, as required by Section 8120, the Secretary of State shall post, in a conspicuous place on his or her Internet Web site, the party preference history of each candidate for voter-nominated office for the preceding 10 years, or for as long as he or she has been eligible to vote in the state if less than 10 years. The candidates’ party preference history shall be continuously posted until such time as the official canvass is completed for the general or special election at which a candidate is elected to the voter-nominated office sought, except that, in the case of a candidate who participated in the primary election and who was not nominated to participate in the general election, the candidate’s party preference history need not continue to be posted following the completion of the official canvass for the primary election in question. (2) For purposes of this subdivision, “party preference history” also refers to the candidate’s history of party registration during the 10 years preceding the effective date of this section. (3) The Secretary of State shall also conspicuously post on the same Internet Web site as that containing the candidates’ party preference history the notice specified by subdivision (b) of Section 9083.5.