Statistics for occurrence #1 of “Mr. Powell” in chapter 34 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.:

...t, it may be well to note some of the significant intimations which it elicited from the more conservative Republicans; as follows: Mr. Dixon (of Conn.) Mr. President, the Senator from Kentucky [ Mr. Powell ] has alluded to remarks of mine, and has said that I have declared on this floor, that, if it were necessary to abolish Slavery in order to save the Union, Slavery should be abolished. Mr. Presiden...
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