Mary Margaret Truman Daniel was an American classical soprano, actress, journalist, radio and television personality, writer, and New York socialite. She was the only child of President Harry S. Truman and First Lady Bess Truman. While her father was president, during the years 1945 to 1953, Margaret regularly accompanied him on campaign trips, most notably the 1948 extensive countrywide train-borne 'Whistle-stop' campaign trip, which lasted several weeks; she also appeared often at important White House and political events during those years. She was a favorite with the media.