“Academics have sketched out several scenarios. Under one, Pence as president of the Senate could throw out both sets of a state’s electors. Another contemplates that the House of Representatives would end up choosing between Biden and Trump. [This scenario would give one vote to each state and since the Republicans have more states with Republican majorities, President Trump would likely be the winner].”
-SB
So I guess this is the swing state legislatures’ way of punting the ball. They don’t want the responsibility of certifying the election for Trump and sending only Trump electors, but they’re also not comfortable giving it away to Biden, so they’ve chosen two slates of electors and will let Congress sort it out. Does that sound about right?