California Code, Civil Code - CIV § 3344.5

(a) Any person whose signature is used in violation of, and any candidate for elective office whose election or defeat is expressly advocated in any campaign advertisement that violates, subdivision (b) of Section 115.1 of the Penal Code, shall have a civil cause of action against any person committing the violation.

(b) If a mass mailing or other printed matter that violates subdivision (b) of Section 115.1 of the Penal Code expressly advocates the election or defeat of more than one candidate only a person whose signature is used and the candidate or candidates to whom the unauthorized signature directly relates shall have a civil cause of action pursuant to this section.

(c) Any person bringing a cause of action pursuant to this section may recover damages in an amount of two times the cost of the communication, but not to exceed fifty thousand dollars ($50,000), with regard to which the unauthorized signature was used.

(d) As used in this section, “signature” means either of the following: