Scott Wike Lucas (February 19, 1892 – February 22, 1968) was an American attorney and politician. A member of the Democratic Party, he represented Illinois in the U.S. House of Representatives (1935–1939) and the U.S. Senate (1939–1951). He was the Senate Majority Leader from 1948 to 1950.
Lucas was born on a tenant farm near Chandlerville, in Cass County, Illinois. He was the youngest of six children of William Douglas and Sarah Catherine (née Underbrink) Lucas. His parents named him after Scott Wike, a Democrat who served a representative from Illinois (1875–1877, 1889–1893). After attending public schools, he began his studies at Illinois Wesleyan University. During college, he was active in athletics He lettered in football, basketball, and baseball and played semiprofessional baseball in the Three-I League during his summer breaks.
Lucas graduated from Wesleyan with a law degree in 1914 and was admitted to the bar the following year. He served as a schoolteacher before entering private practice in Havana. During World War I, he served in the US Army and rose to become a lieutenant.
Lucas returned to his law practice following his military service and served as a state's attorney for Mason County from 1920 to 1925. He also worked as a commander of the Illinois Department of the American Legion. In 1932, he was defeated by William H. Dieterich for the Democratic nomination to challenge Republican incumbent Otis F. Glenn for a United States Senate seat from Illinois.
Lucas was later appointed chairman of State Tax Commission by Governor Henry Horner, serving from 1933 to 1935.
In 1934, following the death of Speaker of the House Henry Thomas Rainey, Lucas was elected to the House of Representatives from Illinois's 20th congressional district. He established himself as a strong supporter of Franklin D. Roosevelt's New Deal, working to pass the Soil Conservation and Domestic Allotment Act of 1936 and the Agricultural Adjustment Act of 1938. However, Lucas disagreed with Roosevelt over the president's court-packing plan, which Lucas denounced as "useless, selfish, and futile."
In 1938, after William Dieterich declined to run for re-election, Lucas was elected to the U.S. Senate over Republican Richard J. Lyons, with a 51%-48% victory. He was re-elected in 1944. With support from Harry Truman, he was elected party whip in 1946. Lucas, a moderate, drew support from both conservative and liberal wings of the party. He took over the Midwest campaign for Truman and was credited with assisting Truman's 1948 re-election and bringing nine Democrats into the Senate. When Alben Barkley became vice-president and resigned his seat, Lucas became majority leader. However, he was unable to build a consensus as Senate Majority Leader with the onset of the anticommunist era, and lost in 1950, to Republican Everett Dirksen. Lucas had become a target of Republican wrath with loss of political power in the Senate and the White House. His 1950 reelection campaign featured the active intervention into Illinois politics of Wisconsin Senator Joseph McCarthy, who traveled the state with Dirksen saying that Senator Lucas was "soft on communism." Dirksen would go on to easily defeat Lucas with a 54% to 46% victory. Privately, in later years, Dirksen attributed his victory to Lucas's focus on not his state but his responsibilities as Senate Majority Leader, and Dirksen was free to campaign locally, often debating Lucas's Illinois Democratic Party proxies and calling attention to Lucas's prolonged absence from the state.