Proposition 140 limited the number of terms that California state senators and representatives can stay in office. Members of the California State Assembly were limited by its provisions to three two-year terms and members of the California State Senate to two four-year terms. It also imposed a lifelong ban against seeking the same office once the limits were reached.
Source for Popular Vote data: California Secretary of State. General Election - Statement of Vote, November 6, 1990, California Secretary of State (http://elections.cdn.sos.ca.gov/sov/1990-general/statewide-measures.pdf) (accessed 29 Sep 2016)