Statistics for occurrence #1 of “Mr. Madison” in chapter 5, page 47 of Horace Greeley, The American Conflict: A History of the Great Rebellion in the United States of America, 1860-65: its Causes, Incidents, and Results: Intended to exhibit especially its moral and political phases with the drift and progress of American opinion respecting human slavery from 1776 to the close of the War for the Union. Volume I.:
...empts have been made to explain away this most unfortunate provision, for the reason that the Convention wisely and decorously excluded the terms Slave and Slavery from the Constitution; because, as Mr. Madison says, they did not choose to admit
...