CA Elec Code Section 9067

If more than one argument for or more than one argument against any measure is filed within the time prescribed, the Secretary of State shall select one of the arguments for printing in the ballot pamphlets. In selecting the argument the Secretary of State shall give preference and priority in the order named to the arguments of the following:

(a)

In the case of a measure submitted by the Legislature, Members of the Legislature.

(b)

In the case of an initiative or referendum measure, the proponent of the petition.

(c)

Bona fide associations of citizens.

(d)

Individual voters.