Counties are communities. Whoever gets the most widespread support should win.
They
are? That's funny, because I have never been to the other side of the county I live in. I don't know anyone there. You know what's the best way to measure widespread support? See who gets the most votes! The electoral college system distills things enough.
And this would not create a Republican landslide in every election. Carter would have done a lot better.
In 2000, an election where Gore received the most votes, this would have resulted in an electoral landslide for Bush:
Bush would have received 487 votes to Gore's 51, or 48, since I suppose this would mean DC wouldn't count (what about Louisiana?). That makes
no sense whatsoever. It would make more sense of counties were assigned electoral votes (however you'd do that) but that would just make the system even more pointlessly confusing.