One other thing. You will note that the test of Article II Sec. 8 does not say that a law passed by referendum cannot be overridden by the legislature.

http://www.leginfo.ca.gov/.const/.article_2

SEC. 8. (a) The initiative is the power of the electors to propose
statutes and amendments to the Constitution and to adopt or reject
them.
(b) An initiative measure may be proposed by presenting to the
Secretary of State a petition that sets forth the text of the
proposed statute or amendment to the Constitution and is certified to
have been signed by electors equal in number to 5 percent in the
case of a statute, and 8 percent in the case of an amendment to the
Constitution, of the votes for all candidates for Governor at the
last gubernatorial election.
(c) The Secretary of State shall then submit the measure at the
next general election held at least 131 days after it qualifies or at
any special statewide election held prior to that general election.
The Governor may call a special statewide election for the measure.

(d) An initiative measure embracing more than one subject may not
be submitted to the electors or have any effect.
(e) An initiative measure shall not include or exclude any
political subdivision of the State from the application or effect of
its provisions based upon approval or disapproval of the initiative
measure, or based upon the casting of a specified percentage of votes
in favor of the measure, by the electors of that political
subdivision.
(f) An initiative measure shall not contain alternative or
cumulative provisions wherein one or more of those provisions would
become law depending upon the casting of a specified percentage of
votes for or against the measure.