Warren Buffett on legendary Washington Post publisher Katharine Graham

Katharine Graham's journey from housewife, to Washington Post publisher, to the first female CEO of a Fortune 500 company, is told in a new documentary, "Becoming Katharine Graham." CBS News' Senior Correspondent Norah O'Donnell talks with one of Graham's closest friends, investor Warren Buffett, about the woman who became a pivotal figure in Washington politics through her newspaper's landmark reporting.