California Proposition 14, Top Two Primaries Act (June 2010) - Ballotpedia: "A California Top Two Primaries Act ballot proposition is on the June 8, 2010 ballot in California as a legislatively-referred constitutional amendment.
If approved by voters, the proposal will require 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 would take effect in the 2012 elections.
Specifically, it would provide for a 'voter-nominated primary election' for each state elective office and congressional office in California. Voters could vote in the primary election for any candidate for a congressional or state elective office without regard to the political party affiliations of either the candidate or the voter. Candidates could choose whether or not to have their political party affiliation displayed on the ballot.
The proposition also prohibits political parties from nominating candidates in a primary, although political parties would be allowed to endorse, support or oppose candidates. Elections for presidential candidates, and for members of political party committees and party central steering committees would not fall under the 'top two' system."
This already failed in 2004. Apparently the idea is to produce two moderate candidates in the general election, instead of a left-wing democrat and a right-wing republican nominated by the foaming-at-the-mouth partisans of their respective parties. The Greens and Libertarians and other minor parties think, correctly, that this will wipe them out entirely because they will never, ever, be number one or number two in the primary, so they won't be on the general election ballot at all.