We recently had a relevant thread that touched on this topic:
https://uselectionatlas.org/FORUM/index.php?topic=173119.0Also interesting is the 2012 shares of state electorates that are white vs non-white. The 2012 exit polls covered only 31 states instead of the normal 50 (bastards...) but here are those numbers.
2012 share of state electorate that is white (31 state list)
Maine - 96%
Vermont - 95%
Iowa - 93%
New Hampshire - 93%
Montana - 89%
Oregon - 88%
Kansas - 87%
Minnesota - 87%
Massachusetts - 86%
Wisconsin - 86%
Indiana - 84%
Connecticut - 79%
Ohio - 79%
Colorado - 78%
Missouri - 78%
Pennsylvania - 78%
Michigan - 77%
Washington - 76%
Arizona - 74%
Illinois - 70%
North Carolina - 70%
Virginia - 70%
Alabama - 68%
New York - 68%
Florida - 67%
New Jersey - 67%
Nevada - 64%
Maryland - 59%
Mississippi - 59%
California - 55%
New Mexico - 51%
National - 72%
2012 share of state electorate that is white (31 state map)
(states in grey had no exit poll in 2012)