The very liberal Dems in the California legislature and our very liberal governor, do not have the final say. They can pass bills repealing the law of gravity, but that doesn't mean we are going to float in the air.
The legislature passes unconstitutional laws all the time which are on occasion thrown out in court. However there is no judicial oversight unless a plaintiff takes the issue to a court. That is what is happening now.
Here're the facts:
On September 19, 2003 California Governor Gray Davis signed in a law the Domestic Partners Rights and Responsibilities Act of 2003, granting gay and lesbian couples most of the rights usually reserved for married heterosexual couples.