California state employees hold important positions in many unions, and will have an influence over which candidates are endorsed by these unions in the presidential primary. Due to the large number of democratic candidates, it appears now that unions will wait until the primary to release their endorsements. There are a lot of presidential candidates who seem to be pro-labor, which means that it will be challenging for unions to choose someone to endorse.
See "California workers have the power to help pick a presidential nominee. Will they use it? Read more here: https://www.sacbee.com/news/politics-government/capitol-alert/article234434197.html#storylink=cpy", Emily Cadei, The Sacramento Bee, August 28, 2019