John B. Henderson

As a United States Senator representing a slave state, Henderson co-authored and co-sponsored the Thirteenth Amendment to the United States Constitution permanently prohibiting slavery in the United States. Henderson's original proposal, made January 11, 1864 was submitted to the Senate Judiciary Committee, and on February 10, 1864 it presented the Senate with a proposal combining the drafts of congressmen James Mitchell Ashley (Republican, Ohio), James Falconer Wilson, (Republican, Iowa), Charles Sumner (Republican, Massachusetts), and Henderson.[1]

John B. Henderson in his elder years.

On January 31, 1865 the 13th Amendment was approved by the U.S. Congress, and on February 1, 1865 it was signed by President Abraham Lincoln. On April 14-15, 1865 Lincoln was assassinated before the amendment was ratified by the State of Georgia on December 6, 1865.

While in the Senate, Henderson was chairman of the Committee to Audit and Control the Contingent Expense (Thirty-ninth Congress) and a member of the Committee on Indian Affairs (Thirty-ninth and Fortieth Congresses).

During President Andrew Johnson's impeachment trial, Henderson broke party ranks, along with six other Republican senators and voted for acquittal. These seven Republican senators were disturbed by how the proceedings had been manipulated in order to give a one-sided presentation of the evidence. Senators William Pitt Fessenden, Joseph S. Fowler, James W. Grimes, John B. Henderson, Lyman Trumbull, Peter G. Van Winkle,[2] and Edmund G. Ross of Kansas, who provided the decisive vote,[3] defied their party and public opinion and voted against impeachment. After the trial, Ben Butler conducted hearings on the widespread reports that Republican senators had been bribed to vote for Johnson's acquittal. In Butler's hearings, and in subsequent inquiries, there was increasing evidence that some acquittal votes were acquired by promises of patronage jobs and cash cards.[4]

Henderson was not a candidate for reelection to the Senate in 1868 and left the U.S. Senate on March 4, 1869.

Henderson was an unsuccessful candidate for Governor of Missouri and later U.S. Senator. In 1875, he was appointed by Ulysses Grant as a special United States attorney for prosecution of the Whiskey Ring at St. Louis. After attempting to stifle Henderson's investigation of the president's personal secretary, Grant fired Henderson on the basis that Henderson's statements to a grand jury regarding Grant were impertinent.[5] Following criticism, Grant appointed a new special prosecutor, James Broadhead, to continue the investigation. In 1877, Henderson was appointed a commissioner to treat with hostile tribes of Indians.