a year. Clayton supported the change, but it became very controversial, and his support of it caused him to lose the nomination of the Federalist Party to Louis McLane, beginning a long rivalry between the two men. Clayton narrowly failed in an attempt to return to the U.S. House of Representatives in the 1818 election, but was returned to the Delaware Senate again in 1821. Then, when Caesar A. Rodney resigned as U.S. Senator from Delaware, the General Assembly elected him to serve out the term, from January 8, 1824 to March 3, 1827. This was the time when the old party system of Federalists and Jeffersonian Republicans was giving way to the Jacksonian Democrats, and those opposed to Jackson. Clayton, his family, and much of the old Federalist following in Delaware, aligned themselves with John Quincy Adams, and the National Republicans who would later become Whigs. After his term in the U.S. Senate ended, Clayton was appointed Chief Justice of the Delaware Court of Common Pleas in 1828. This court ceased to exist with the new Delaware Constitution of 1831, and Clayton was appointed Chief Justice of the new Delaware Superior Court in 1832. In 1833, Chief Justice Clayton became one of the initial trustees of Newark College in Newark, Delaware, which would later become the University of Delaware. In 1837, Clayton's cousin, U.S. Senator John M. Clayton, resigned his office. Thomas Clayton was once again elected to the U.S. Senate to finish the term. After it ended, he was reelected in 1841 and served from January 9, 1837 to March 3, 1847. During this second period of service in the Senate, Clayton was at various times the Chairman of the Committee on Printing and a member of the Committee of Revolutionary Claims. Death and legacy Clayton died of pneumonia at his retirement home at New Castle and is buried in the Old Presbyterian Cemetery, which is at Dover, on the grounds of the Delaware State Museum. "A handsome man with polished manners, he was a stickler for dignity, decorum and punctuality at court session, and once ordered himself fined $10 for being 10 minutes late in appearing in court." Thomas Scharf comments: "Chief Justice Clayton was profoundly versed in the principles of the law. He had a marvelous skill in perceiving the vital points of a case, largely due to his almost intuitive grasp of fundamental principles. He