What proposition established a blanket primary and was eventually ruled to be unconstitutional by the U.S. Supreme Court?

Question

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Proposition 198, passed in California, established a blanket primary system where voters could choose any candidate regardless of the voter's or candidate's party affiliation. The U.S. Supreme Court ruled it unconstitutional in California Democratic Party v. Jones because it violated political parties' First Amendment right of association.

What Proposition Established a Blanket Primary and Was Eventually Ruled