This California popular vote ‘referendum’ would be over-turned, properly, by the U.S. Supreme Court. The power to decided the allocation of Presidential and Vice-Presidential Electors was given exclusively to the State Legislature, period. A popular referendum is NOT an act of the State Legislature.
The power to appoint, select or hold elections for Electors belongs to the Legislature of the States - it remains one of the last State Powers that has not been gutted by the Federal Government or Amendment.
dvwjr
You are no doubt correct.
If the legislature decides to abide by the referendum, or by it’s own laws allows a referendum to bind it to the decision, then it would be much harder to overturn.