Cal. Gov. Code § 85312
For purposes of this title, payments for communications to members, employees, shareholders, or families of members, employees, or shareholders of an organization for the purpose of supporting or opposing a candidate or a ballot measure are not contributions or expenditures, provided those payments are not made for general public advertising such as broadcasting, billboards, and newspaper advertisements. However, payments made by a political party for communications to a member who is registered as expressing a preference for that party on that member's affidavit of registration pursuant to Sections 2150, 2151, and 2152 of the Elections Code that would otherwise qualify as contributions or expenditures shall be reported in accordance with Article 2 (commencing with Section 84200) of Chapter 4, and Chapter 4.6 (commencing with Section 84600), of this title.
Ca. Gov. Code § 85312