According to "Decline to State - Voter Information":
California currently has a "modified" closed primary system. SB 28 (Ch. 898, Stats. 2000), relating to primary elections, was chaptered on September 29, 2000 and took effect on January 1, 2001. SB 28 implemented a "modified" closed primary system that permits unaffiliated ("decline to state") voters to participate in a primary election if authorized by an individual party's rules and duly noticed by the Secretary of State. ... You may request, from your county elections official or at your polling place, the ballot of a political party if authorized by the party's rules and duly noticed by the Secretary of State. [emphasis added]
As a "decline to state" registered voter, your participation in the California Republican primary is not a right, but a privilege granted at the discretion of the party, if it feels it is to its advantage to do so. It certainly seems likely the party bosses would prefer to keep all the libertarians out of their primary this time, and if they do, you'll have no basis for any objection. It's their party, they can invite whomever they want.
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