John Mercer Langston
Langston was elected town clerk of Brownhelm Township, Ohio in 1855, documented as the first Black American elected to public office in the United States. He served as dean of Howard University’s law school, helped recruit Black regiments for the Union Army during the Civil War, and was elected to Congress from Virginia in 1890 - a seat he won after the Virginia legislature’s attempt to have his opponent declared the winner was overturned by the House.
He served only the final months of the term after the seating dispute delayed his entry; the structural use of post-election legal challenges to prevent Black electoral victories from taking effect was a documented feature of post-Reconstruction Southern politics.