In a 1998 Washington Post article, journalist Carl S. Anthony wrote that Harding had extramarital affairs and sexual encounters with numerous women. These women included Susie Hodder and Carrie Fulton Phillips, Mrs. Harding's personal friends; Grace Cross, Harding's senatorial aide; and Nan Britton, a 22-year old campaign volunteer (President Harding was age 51 when the affair occurred). Anthony stated that Harding was the father of Hodder's daughter. In her 1927 book, The President's Daughter, Britton said that Harding fathered her daughter, Elizabeth Ann, as well, during a 1919 tryst in his senatorial offices. Britton, who had a profound obsession with Harding beginning in high school, also said that she was his mistress before and during his administration – reportedly, this included at least one infamous tryst in a White House closet and while guarded by United States Secret Service agents. Historian Henry F. Graff states that Harding was sterile and that Harding's affair with Britton ended after Harding assumed the presidency.The Library of Congress publicly opened letters between Phillips and Harding on July 29, 2014.