This study uses opinion data to assess the basis of public support for California's term limit initiative (Proposition 140). We test if support was higher among members of demographic groups under-represented in the state's legislature, if support displays a partisan bias, and if campaign contacts are associated with opinions. Ethnic and racial characteristics display little association with support; however women and younger voters were more supportive. Partisanship and campaign effects appear to have played an important role in shaping support for the initiative.