for the Democratic nomination for the United States Senate. During the campaign, he criticized Caraway for her support for the 1937 Reorganization Act and accused her of having "improper influence" over federal employees in Arkansas. Nevertheless, he was defeated in the primary election by a margin of about 8,000 votes. He subsequently resumed the practice of law in Camden, where he joined the firm Gaughan, McClellan and Gaughan. He served as a delegate to the Democratic National Convention in 1940 (Chicago), 1944 (Chicago), and 1948 (Philadelphia). U.S. Senate In 1942, after G. Lloyd Spencer decided not to seek re-election, McClellan ran for the Senate again and this time won. He served as senator from Arkansas from 1943 to 1977, when he died in office. During his tenure, he served as chairman of the Appropriations Committee and served 22 years as chairman of the Committee on Government Operations. McClellan was the longest serving United States Senator in Arkansas history. During the later part of his Senate service, Arkansas had, perhaps, the most powerful Congressional delegations with McClellan as chairman of the Senate Appropriations Committee, Wilbur Mills as chairman of the House Ways and Means Committee, Oren Harris as chairman of the House Commerce Committee, Senator J. William Fulbright as chairman of the Senate Foreign Relations Committee, Took Gathings as chairman of the House Agriculture Committee, and James William Trimble as a member of the powerful House Rules Committee. McClellan also served for eighteen years as chairman of the Senate Permanent Subcommittee on Investigations (1955–73) and continued the hearings into subversive activities at U.S. Army Signal Corps, Fort Monmouth, New Jersey, where Soviet spies Julius Rosenberg, Al Sarant and Joel Barr all worked in the 1940s. He was a participant in the famous Army-McCarthy Hearings and led a Democratic walkout of that subcommittee in protest of Senator Joseph McCarthy's conduct in those hearings. McClellan appeared in the 2005 movie Good Night, and Good Luck in footage from the actual hearings. McClellan led two other investigations which were both televised uncovering spectacular law-breaking and corruption. The first, under the United States Senate Select Committee on Improper Activities in Labor and Management, also known as the McClellan Committee, investigated union corruption and centered on Jimmy Hoffa and lasted from January 1957 to March 1960. In April 1961, during a Senate Investigations Committee hearing, contractor Henry Gable asserted that Communists would not be able to