Washington state constitution
Article II
Section 1

(e) The legislature shall provide methods of publicity of all laws or parts of laws, and amendments to the Constitution referred to the people with arguments for and against the laws and amendments so referred. The secretary of state shall send one copy of the publication to each individual place of residence in the state and shall make such additional distribution as he shall determine necessary to reasonably assure that each voter will have an opportunity to study the measures prior to election.