California voted for open primaries.
"A California Top Two Primaries Act ballot proposition was on the June 8, 2010 ballot in California as a legislatively-referred constitutional amendment, where it was approved.
"Proposition 14 requires that candidates run in a single primary open to all registered voters, with the top two vote-getters meeting in a runoff. The new system will take effect in the 2012 elections."
http://ballotpedia.org/wiki/index.php/California_Proposition_14,_Top_Two_Primaries_Act_(June_2010)
Prop 14 applies to everything EXCEPT the CA presidential primary.