While I'm all about states rights, this is exclusively a Federal issue. CA has no jurisdiction.
Not only is this targeted + selective, its not based on principle but rather about hurting Trump. It also opens the door to poll tax kind of gimmicks to keep oppo candidates off the ballot.
Actually, I think it is mostly a state issue. The only thing the Constitution says about the selection of Presidential Electors is in Article II:
Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress:There doesn't even have to be voting by citizens in the state for the electors. A state could pass a law stating that the legislature itself will choose the Presidential electors when it is time for a President election. In fact, for the first couple elections, most state legislatures
did choose electors directly. So, a state like California could constitutional rig future elections directly simply by stating that the state legislature will choose a slate of electors. No voting at all.
Personally, I think that if a state is permitted to do
that, then it can set whatever additional requirements it wants as long as it doesn't violate some other provision of the Constitution. I don't like that result...but I think it is Constitutional. That is, unless there is some specific federal
law somewhere that this would violate. But I'm not aware of any.
That being said, I'd expect the Supreme Court to say it is unconstitutional anyway simply because they wouldn't like the result, and the chaos that could result if states started actually taking Article II seriously.