Grading The Best And Worst U.S. Presidents

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James Buchanan is often regarded as the worst American president, while Abraham Lincoln is seen as the best. / Wikimedia Commons

Being president of the United States is a job very few Americans have held -- 43, to be exact.  There's some argument over who was the best among them. But who was the worst? Robert Strauss says the worst American president is James Buchanan and he argues that point in his new book, “Worst President Ever.” We talk with him and Kenneth C. Davis, author of the book, “Don't Know Much About the American Presidents.”