To make every state do it would require a constitutional amendment. But two states already do it, so you can get legislatures to do it on a state-by-state basis without the need of an amendment. You might not be successful at that, however.
Remember, in the beginning, the legislatures chose the electors. They exercised their best judgment and were not bound in the same way they are now.
Understood. I want a constitutional amendment to put all states on equal footing and to have the will of the voters in each district heard. The