Cal. Elections Code § 3122

(a) If a military or overseas voter’s mistake or omission in the completion of a document under this chapter does not prevent determining whether a military or overseas voter is eligible to vote, the mistake or omission does not invalidate the document. In a write-in ballot authorized by this chapter, if the intention of the voter is discernible under this state’s uniform definition of what constitutes a vote and the ballot is eligible to be counted pursuant to Sections 3019 and 3106, an abbreviation, misspelling, or other minor variation in the form of the name of a candidate or a political party shall be accepted as a valid vote. (b) An authentication, other than the declaration specified in Section 3106 or 3118 or the declaration on the federal postcard application and federal write-in absentee ballot, is not required for execution of a document under this chapter. The declaration and any information in the declaration may be compared with information on file to ascertain the validity of the document.