Something for everybody’s consideration:
In 2008, Obama beat McCain with 365 to 173 EV.
I every state in the union followed a CD proportion with state winner taking the remaining 2 EVs, the split would have been 301 for Obama and 237 for McCain.
I believe if you did that for all elections back to 1960 (maybe further), you would find that the idea doesn’t change a single election’s results.