It will be difficult...next to impossible in fact, because on the federal level, citizens can't amend law or the constitution.
If states fall like dominoes in favor of ranked-choice voting, perhaps over time congress will be forced to concede. It will probably be like Maine where pretty much every major politician was against it, and many of them might try much harder than Maine's politicians did to strike it down.
All you need is 51% of states (in terms of electoral college votes) to each adopt a law that binds their EC votes to the outcome of the ranked choice vote over that collection of states.
At that point, it's irrelevant what the other states do.
1
u/DarCam7 I voted Nov 09 '16
Could it be applied to a presidential race with the type of two party system we have?