[DoodleDawg]

How is this even legal?

The 10th and 12th Amendments say so. How the electors are chosen is up to the states.

[Thud]

Actually no. How electors are chosen is not the same as how electors vote. Electors have not always voted for the winner of their state's popular vote, and I suspect the same will be true for the national popular vote winner.

My point is that there is definitely still some wiggle room in whether states can require electors to vote in a particular way. I'm sure that state laws requiring electors to vote for the national popular vote winner will be challenged in court AND ignored by at least some Republican electors whatever the courts rule.