INITIATIVE. REFERENDUM. CITY, CITY AND COUNTY CHARTER. INITIATIVE CONSTITUTIONAL AMENDMENT AND STATUTE. Amends constitution to authorize adoption of non-binding advisory measures by initiative, and to require voter approval or passage by three-fourths vote of each legislative house of statutes affecting procedures for circulation or qualification of initiative or referendum petitions. Amends Election Code to decrease signatures required to qualify measures amending or repealing city and city and county charters by permitting vote when petition signed by registered voters totaling 15% (city measures) or 10% (city and county measures) of votes cast in previous general election at which governor elected. Summary of estimate by Legislative Anal...