Statistics for occurrence #1 of “Senator Clingman” in entry congress-national of Harper's Encyclopedia of United States History:

...ackson and Buchanan under similar circumstances. See Buchanan, James. In the House of Representatives open declarations of disunion sentiments were made at the beginning. In the Senate, also, Senator Clingman boldly avowed the intention of the slave-labor States to revolt. I tell those gentlemen [his political opponents] in perfect frankness that, in my judgment, not only will a number of States secede ...
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