California Code, Education Code - EDC § 7056

(a) Nothing in this article prevents an officer or employee of a local agency from soliciting or receiving political funds or contributions to promote the support or defeat a ballot measure that would affect the rate of pay, hours of work, retirement, civil service, or other working conditions of officers or employees of the local agency. These activities are prohibited during working hours. In addition, entry into buildings and grounds under the control of a local agency for such purposes during working hours is also prohibited.

(b) Nothing in this section shall be construed to prohibit any recognized employee organization or its officers, agents, and representatives from soliciting or receiving political funds or contributions from employee members to promote the support or defeat of any ballot measure on school district property or community college district property during nonworking time. As used in this subdivision, “nonworking time” means time outside an employee's working hours, whether before or after school or during the employee's luncheon period or other scheduled work intermittency during the schoolday.