De Klerk says that "Any democracy in which one party has 65 percent of the vote and all the other parties share in the remaining 35 is not healthy"

"Any democracy in which one party has 65 percent of the vote and all the other parties share in the remaining 35 is not healthy," said de Klerk, who spoke with Amanpour during a summit of Nobel laureates in Chicago.

"On paper, we have a wonderful constitution. We've had a number of successful, free elections. We've had peaceful handover of power from one president to the other. So we really comply with the definition of a good democracy. But the party political situation needs to be normalized."

De Klerk said the system is failing to deliver to the people.

"The main failure, why we haven't made better progress," he said, "does not lie in any way whatsoever in the agreements we reached, which we negotiated between 1990 and 1994 and 1996. We agreed upon a good constitution, which is a transformational document.

Two decades ago, de Klerk joined with then-African National Congress leader Nelson Mandela to end the notorious system of racial separation known as apartheid. Their efforts led to a Nobel Peace Prize. 

Sources:

CNN.com