Statistics for occurrence #1 of “Senator Mason” in chapter 16 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.:

...rovisions provoked strenuous opposition. The new Fugitive Slave Law proved especially obnoxious, both in principle and practice, to a large and earnest minority. It had been originally drafted by Senator Mason , of Virginia--a man conspicuously charged with that pro-Slavery venom which has since made him a leading Rebel--and who had already signalized himself by his efforts to render the maintenance of the ...
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