The Electoral College yesterday voted for dual sets of electors in seven states: PA, GA, MI, WI, AZ, NV, and NM. In each instance, one slate would elect Joe Biden, the other would elect Donald Trump.
It’s an unusual circumstance, but it has happened before:
In 2020, legal challenges are pending in the dual-slate states. Without the alternate electors those challenges would be mooted.
As in 1960, the incumbent Vice President may choose between any dual electoral slates delivered to the joint session of Congress for certifying the election.