On November 8, the state of Washington asked the U.S. Supreme Court not to hear Chiafalo v Washington, 19-465. This is the case over whether Washington violated the U.S. Constitution when it fined three presidential electors after they voted for someone other than Hillary Clinton in December 2016.
The state’s brief says there is an “unbroken practice” since the Constitution has been in effect that electors do not vote for someone other than the person who received the most popular votes in that state. This is false. Here is the state’s brief.