When Did Margaret Truman Daniel Die?

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, such as the 1948 countrywide whistle-stop campaign lasting several weeks.