The US Constitution supersedes in this case, because the state legislatures powers regarding federal elections are plenary.

Word nerd here...since I just learned this one today, I figured someone else might be wondering what is plenary power...it's power that is absolute or without limitation

Millions of clamoring patriots clogged the streets of every city until the president was granted lifetime plenary power to suspend elections and eradicate terrorists, traitors, and communists.

The US Constitution supersedes in this case, because the state legislatures powers regarding federal elections are plenary.

Word nerd here...since I just learned this one today, I figured someone else might be wondering what is plenary power...it's power that is absolute or without limitation.