California Code, Elections Code - ELEC § 15490

In each county the number of candidates for member of central committees to be elected in each central committee election district who receive the highest number of votes shall be declared elected. The names and votes of all nominees for partisan public office qualified for central committees membership pursuant to Section 7755 shall be excluded from the list of candidates for member of central committees and disregarded in the determination of the candidates with the highest number of votes.

No write-in candidate for member of central committees shall be declared elected, however, unless that candidate has received a number of votes equal to or greater than 2 percent of the number of party members voting in the central committee election district at the direct primary, or 20 votes, whichever is less.