"Coolidge was the last president to write all of his own speeches." Not so "Silent Cal" after all! Calvin Coolidge became president after Warren Harding's sudden death in 1923. The Calvin Coolidge Presidential Foundation and Library of Congress mark the centennial of the 30th president's ascension to office with a conference on his political development, signature economic policies, and legacy. Watch, starting at 3:15pm ET, Saturday on C-SPAN 2 | American History TV