Thanks for the example of California. I expect there may be more. However, the main thing I wanted to point out in my post was OP's confusion, shared by many, regarding what entities are prohibited from infringing on constitutional rights. Only government (or in some cases quasi-government) entities are prohibited from infringing constitutional rights. Private entities can in most cases do whatever they want, unless a statutory law (i.e., a non-constitutional law) has been enacted prohibiting their action.
Also, I don't know much about the CA law you quote, though I wonder whether it prohibits political discrimination in the _hiring_ of employees at all. Section 1102 definitely prohibits firing based on political activity. I don't see anything that says you can't discriminate on a political basis in _hiring_. Perhaps that is in a different section. I tend to think, e.g., that the Democratic Party organization would not be forced to consider hiring Republicans equally with Democrats, not sure how that's dealt with.
Also, I don't know much about the CA law you quote, though I wonder whether it prohibits political discrimination in the _hiring_ of employees at all. Section 1102 definitely prohibits firing based on political activity. I don't see anything that says you can't discriminate on a political basis in _hiring_. Perhaps that is in a different section. I tend to think, e.g., that the Democratic Party organization would not be forced to consider hiring Republicans equally with Democrats, not sure how that's dealt with.