Cocke was an elected member of the
Virginia House of Burgesses. In 1776, as a
colonel of
militia, he led a company of men into North Carolina's
Washington District for action against the
Indians. Cocke suffered accusations of cowardice following his actions at the
Battle of Island Flats that followed him throughout his life. Later that year, he left Virginia and moved to what was to become Tennessee. During the organization of the
State of Franklin, Cocke was elected as the would-be state's delegate to the
Congress of the Confederation. In 1796, Cocke was chosen as a delegate to the convention that wrote the first
Tennessee Constitution. The newly formed government selected Cocke to be one of the new
state's initial senators, along with
William Blount. Cocke and Blount presented their credentials to the United States Senate on May 9, 1796. The Senate, however, refused to seat Cocke and Blount while the debate regarding the admission of Tennessee into the Union was on. When Tennessee was finally admitted on June 1, the issue of Cocke and Blount's seating was again raised. The Federalist Senate held by a narrow margin (11–10) that Cocke and Blount's election was illegal because it had occurred without congressional authorization. The Tennessee legislature duly re-selected Cocke and Blount on August 2. Cocke's initial term expired on March 3, 1797. The
Tennessee General Assembly, however, neglected to elect a successor to Cocke; he was subsequently appointed to his former seat by
Governor John Sevier on April 22, 1797, until the General Assembly belatedly elected his successor,
Andrew Jackson. Later, he was elected by the Tennessee Assembly to the other U.S. Senate seat, and served from March 4, 1799, to March 3, 1805. Cocke was appointed a judge of the First Circuit Court of Tennessee. On November 7, 1811, he was
impeached by the
Tennessee House of Representatives, and on October 10, 1812, at the end of his
impeachment trial, he was convicted by the
Tennessee Senate on one of the three
articles of impeachment and thereby removed from office. In 1816 he was a witness to a treaty with the Chickasaw that was negotiated by Andrew Jackson and others. ==Personal life and family==