Statistics for occurrence #1 of “Mr. Buchanan” in chapter 17 of William H. Herndon, Jesse William Weik, Herndon's Lincoln: The True Story of a Great Life, Etiam in minimis major, The History and Personal Recollections of Abraham Lincoln by William H. Herndon, for twenty years his friend and Jesse William Weik:

... its conclusion the customary oath was administered by the venerable Chief Justice Taney, and he was now clothed with all the powers and privileges of Chief Magistrate of the nation. He accompanied Mr. Buchanan to the White House and here the historic bachelor of Lancaster bade him farewell, bespeaking for him a peaceful, prosperous, and successful administration. One who witnessed the impressive scene...
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