California's structure mirrors the federal system, with crucial twists.
California has the standard three-branch structure: a bicameral Legislature (40-seat Senate + 80-seat Assembly), a Governor with veto power, and a Judiciary headed by a 7-member Supreme Court appointed by the governor and confirmed by voters.
The crucial twist: California has direct democracy baked into the constitution since 1911. Voters can pass laws (initiative), repeal laws (referendum), and remove officials (recall) without legislative consent. This effectively makes the electorate a fourth branch with veto power over the other three.
Term limits, set by Prop 140 (1990) and modified by Prop 28 (2012), cap legislators at 12 years total — any combination of Senate and Assembly. The pre-2012 limits (6 years Assembly / 8 years Senate) caused chronic turnover that critics argue weakened the legislature relative to lobbyists and staff. The 2012 reform let legislators stay in one chamber longer.