Corporations Code § 7523
ARTICLE 2. Additional Provisions Relating to Election of Directors
Where a corporation with 500 or more members publishes any material soliciting a vote for any nominee for director in any publication owned or controlled by the corporation, the corporation may provide that it shall make available to all other nominees, in the same issue of the publication, an equal amount of space, with equal prominence, to be used by the nominee for a purpose reasonably related to the election.