If the Sioux are supposedly angry that there are sculptures on the mountain now, adding a fifth face wouldn't improve things. Anyway, the four there were great Americans and dead when the monument was sculpted...by a great artist. So they are supposed to add a portrait of a man who is still living whose main accomplishment was being elected President? President Garfield should go up there before Obama--Garfield was a former college President and had been a general in the Civil War.
Even Garfield the Cat would deserve to be there before Obama.