David Pietrusza, author of 1920: The Year of the Six Presidents, profiles America's 30th president, Calvin Coolidge.  Mr. Pietrusza presents a collection of President Coolidge's speeches, examples of his political thinking, and photos, editorial cartoons and campaign memorabilia that spanned his political career.  David Pietrusza discussed President Calvin Coolidge at the William K. Sanford Library in Loudonville, New York.