We never found out in Vietnam, there should have been elections supervised by the UN as agreed in Geneva, Ho Chi Minh would probably have won, thats why the stooges in the South and the Americans didn't want that election, also the border between North and South was only supposed to be temporary until after those elections leading to the Country being unified, also Governments with an element of Marxism have been elected until they were overthrown by US backed coups, Chile, Nicaragua, attempts in Venezuela, there are quite a few others.