After nearly 100 years of rumors and historical speculation, DNA testing has confirmed that President Warren Harding had a child out of wedlock – his only biological child – with mistress Nan Britton. Britton first came forward publically with the claim that her daughter, Elizabeth Ann, was Harding’s daughter in a 1927 autobiography “The President’s Daughter.” In her account, Britton detailed a steamy six-year-long affair with the 29th president, including one encounter in a White House closet, before his untimely death in 1923. At the time of its publishing, the book was met with public ridicule and widely discounted as...