Cal. Gov't Code § 82025
(b) A payment is made for political purposes if it is any of the following:
(2) Made by any of the following:
(c) “Expenditure” includes any monetary or nonmonetary payment made by any person, other than the persons or organizations described in subdivision (b), that is used for communications that expressly advocate the nomination, election, or defeat of a clearly identified candidate or candidates, or the qualification, passage, or defeat of a clearly identified ballot measure.
(1) “Clearly identified” is defined as follows:
(2) A communication “expressly advocates” the nomination, election, or defeat of a candidate or the qualification, passage, or defeat of a measure if it contains express words of advocacy such as “vote for,” “elect,” “support,” “cast your ballot,” “vote against,” “defeat,” “reject,” “sign petitions for,” or, within 60 days before an election in which the candidate or measure appears on the ballot, the communication otherwise refers to a clearly identified candidate or measure so that the communication, taken as a whole, unambiguously urges a particular result in an election.
(A) Except for those communications paid for with public moneys by a state or local government agency, a communication, taken as a whole, unambiguously urges a particular result in an election if it is not susceptible of any reasonable interpretation other than as an appeal to vote for or against a specific candidate or measure. A communication is not susceptible of any reasonable interpretation other than as an appeal to vote for or against a specific candidate or measure when, taken as a whole, it could only be interpreted by a reasonable person as containing an appeal to vote for or against a specific candidate or measure because of both of the following:
(D) Safe Harbor. A communication does not expressly advocate the nomination, election, or defeat of a candidate, or the qualification, passage, or defeat of a measure, within the meaning of this section, if both of the following apply:
(3) Reporting Expenditures.
(4) Except for those communications paid for with public moneys by a state or local government agency, notwithstanding this subdivision, “expenditure” does not include costs incurred for communications that expressly advocate the nomination, election, or defeat of a clearly identified candidate or candidates, or the qualification, passage, or defeat of a clearly identified measure or measures by either of the following: