Former U.S. President Barack Obama, giving the annual Mandela lecture in South Africa, said that "objective reality" is the basis for politics, and that without facts, there is no basis for cooperation. "Too much of politics today seems to reject the concept of objective truth."

Former President Barack Obama weighed in with his perspective on the "strange and uncertain times that we are in" as he delivered a major address in South Africa Tuesday.

Full transcript of Mr. Obama's speech in South Africa:

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