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New DNA tests confirm that President Warren Harding fathered an illegitimate daughter with Nan Britton, a woman dismissed as a 'degenerate' for her claims at the time. We speak to Harding's grand-nephew Dr Peter Harding, who initiated the tests and to James Robenalt, one of Harding's biographers (Photo: Nan Britton and her daughter, Elizabeth Ann Britton Credit: AP)
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