Elliott arrived in South Carolina in 1867 at the age of 25, where he established a law practice. Elliott helped organize the localRepublican Party and served in the state constitutional convention in 1868 as a delegate from the Edgefield district. In the late 1860s he was hired by AME bishop and fellow future congressman Richard H. Cain to be an associate editor of the paper, the South Carolina Leader, along with another future congressman, Alonzo J. Ransier In 1868 he was elected to the South Carolina House of Representatives. The next year he was appointed assistant adjutant-general; he was the first African-American commanding general of the South Carolina National Guard. As part of his job, he helped form a state militia to fight the Ku Klux Klan. Elliott was elected as a Republican to the Forty-second United States Congress, defeating Democrat John E. Bacon. He was re-elected to the Forty-third United States Congress, defeating Democrat William H. McCann. In Congress in April 1871 he gave a notable speech on the "Bill to Enforce the Provisions of the Fourteenth Amendment to the Constitution", also known as the "Ku Klux Bill". He again "delivered a celebrated speech" in favor of the Civil Rights Act of 1875. He resigned on November 1, 1874, to serve as sheriff and fight political corruption in South Carolina. He served again in the South Carolina House of Representatives, where he was elected as Speaker of the House. He ran successfully for South Carolina Attorney General in 1876. In the state elections that year, white Democrats regained dominance of the state legislature. The following year, 1877, when the last of the federal troops were withdrawn from South Carolina, he was forced out of office. In 1878 he formed a law partnership with D. Augustus Straker and T. McCants Stewart. He continued to be involved in politics, working on then-Treasury Secretary John Sherman's campaign for President in 1880, and was a delegate to the 1880 Republican National Convention. In January 1881 he was part of a black delegation that met with President James Garfield to protest the lack of civil and political rights in the South. However, his law practice faltered. In 1879, he was appointed a customs inspector for the Treasury Department in Charleston, South Carolina. He contracted malaria while working in that capacity on a trip to Florida. In 1881, he was transferred to New Orleans, and in 1882 he was dismissed. In New Orleans he again attempted to practice law, but found few clients. Impoverished, he died in New Orleans on August 9, 1884.
