Statistics for occurrence #1 of “Mr. Pinchback” in chapter 14 of Mrs. John A. Logan, Reminiscences of a Soldier's Wife: An Autobiography:

...he matter of the reconstruction of the Southern States was still at white heat, and it was supposed that the Louisiana question would furnish food for many an exciting controversy in the Senate. Mr. Pinchback had been elected United States senator from Louisiana, and was bitterly opposed because of the fact that it was said he had colored blood in his veins. Every day some member of the House or Senate ...
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