My suggestion is much simpler. Just have a law that all electors are bound to vote for the candidate who gets the most votes nationally.
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The only block of votes I have heard might be blocked are military votes.

What about all those people barred from voting because they might or might not have a conviction for which they've already been punished (apart from the ones who didn't have any conviction in the first place, but still had their vote stolen)? That's wouldn't be legal in most democracies - and probably isn't actually constitutional in yours, if it ever got tested through the Supteme Court.