Caswell saw John C. [—] presiding over the United States Senate.

The evidence

• “As I am giving a short description of vice-presidents whom I knew, I will also mention one I did not know. I did not meet, but saw him presiding over the Senate in February, 1859. This was John C.”

  1900-caswell-reminiscences/11-reflections-and-conclusion.md, PDF pp. 3–27

  Caswell, Lucien Bonaparte. The Reminiscences of the Hon. L. B. Caswell. Written at Fort Atkinson, Wis., 1914–1916; four-column newspaper reprint, newspaper and date unidentified. University of Wisconsin-Madison Libraries.

  Grade A: Found on a page of one of our sources