Section 6621 Of Article 6. American Independent Presidential Primary Ballot From California Elections Code >> Division 6. >> Part 1. >> Chapter 3. >> Article 6.

. 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.