Remember The Constitution says any rights not specifically granted to the Feds are the States.
The Supreme Court, to thunderous applause and cheering, killed that notion a LONG time ago. I wish California the best of luck in trying to resurrect the idea, I truly do, but I wouldn't hold your breath.
Even now most Progressives wouldn't like the idea in practice. They've spent over a century fighting to create a Federal Government that is Large and In Charge.
The closest I've ever found was a heavily moderated sub on Reddit. I have no idea if its still any good or not because I haven't been there in over a year.