California Elections Code
Sec. § 9501.5


A ballot argument shall not be accepted under this article unless accompanied by the printed name and signature or printed names and signatures of the person or persons submitting it or, if submitted on behalf of an organization, the name of the organization and the printed name and signature of at least one of its principal officers.
No more than five signatures shall appear with any argument submitted under this article. If any argument is signed by more than five persons, the signatures of the first five shall be printed.
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Jun. 6, 2016