A brief description from Ballotpedia
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. (snip)
Specifically, Proposition 14 provides for a "voter-nominated primary election" for each state elective office and congressional office in California. Voters can 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 can choose whether or not to have their political party affiliation displayed on the ballot.
Proposition 14 prohibits political parties from nominating candidates in a primary, although political parties will be allowed to endorse, support or oppose candidates. Elections for presidential candidates, and for members of political party committees and party central steering committees do not fall under the "top two" system.
And here's a link
to the complete text of the original Proposition 14.
Awful idea. All that does is prevent Republicans from having a chance because with how outnumbered they are in CA, the top 2 will always be democrats.
Leave and come back when you know what you're talking about.