Section 6441 Of Article 8. Write-in Candidates From California Elections Code >> Division 6. >> Part 1. >> Chapter 2. >> Article 8.

. Any person who believes his or her name may be used as a write-in candidate for President of the United States shall, not later than 21 days before the primary election, file his or her endorsement of his or her write-in candidacy with the Secretary of State, or no votes shall be counted for him or her.