[1] In 1825 he became clerk of the court of Pulaski County, Arkansas, and served for four years, During this time he studied law with Robert Crittenden and had become a lawyer.
[1] He was adjutant to Crittenden at the November 15th 1824 treaty with the Quapaws, and aide-de-camp to General William Bradford (1771–1826) in 1826.
[1] When Archibald Yell resigned his seat in Congress to become colonel of the Arkansas volunteer regiment in the Mexican–American War in 1847, Newton was elected to fill the unexpired term and served as a Whig in the Twenty-ninth Congress.
Newton served in Washington for only a month, and declined to run for a full term.
[2] on September 22, 1853, at the age of 49, Newton died in New York City and is buried in the historic Mount Holly Cemetery in Little Rock.