Washington State Senator Patty Kuderer (D-Bellevue) has introduced SB 5074. It would provide that a presidential elector who did not vote for the presidential candidate who received the most popular votes in the state would be replaced. All parties, and also independent presidential candidates, would have been required in advance to submit not only a list of presidential elector candidates, but also a list of an equal number of replacement presidential electors.
Washington state now fines “faithless” presidential electors, but allows them to vote for anyone, and counts that vote.
For more, see how electors are chosen.