On February 26, the Washington State Senate passed SB 5074 by 26-20. It says that if a presidential elector votes for someone other than the person who received the most popular votes in the state, then that person is deemed to have resigned and will be replaced by someone chosen by the other electors.
It seems peculiar for the legislature to pass this bill now, when soon there will be a decision from the Washington State Supreme Court on whether the U.S. Constitution does permits states to punish presidential electors for voting in unexpected ways.