Statistics for occurrence #1 of “Mr. Lincoln” in chapter 16 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:

...entioned in connection with the Republican nomination for the Presidency. To be classed with Seward, Chase, McLean, and other celebrities was enough to stimulate any Illinois lawyer's pride; but in Mr. Lincoln 's case, if it had any such effect, he was most artful in concealing it. Now and then some ardent friend, an editor, for example, would run his name up to the mast-head, but in all cases he discourage...
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