The Sonoma County Democratic Party has endorsed a number of candidates for county-wide offices, as well as Regional Measure 3. SCDP endorsements are here: http://www.sonomademocrats.info/2018/05/10/local-endorsements/ . Particularly notable are endorsements for Sheriff (John Mutz) and County Clerk-Recorder-Assessor (Deva Marie Proto).
Endorsements for state legislative positions are made by the California Democratic Party. You’ll find endorsements for Congress (CD 2 – Jared Huffman), State Senate (SD 2 – Mike McGuire), and State Assembly (AD 2 – Jim Wood) at https://www.cadem.org/vote/body/CDP-2018-Endorsements-Official-18-04-08.pdf, as well as endorsements for state-wide positions such as State Controller, and for state ballot propositions.