Ransom, Allen Tate, and Donald Davidson). In "The Briar Patch" the young Warren defends racial segregation, in line with the political leanings of the Agrarian group, although Davidson deemed Warren's stances in the essay so progressive that he argued for excluding it from the collection. However, Warren recanted these views in an article on the civil rights movement, "Divided South Searches Its Soul", which appeared in the July 9, 1956 issue of Life magazine. A month later, Warren published an expanded version of the article as a small book titled Segregation: The Inner Conflict in the South. He subsequently adopted a high profile as a supporter of racial integration. In 1965, he published Who Speaks for the Negro?, a collection of interviews with black civil rights leaders including Malcolm X and Martin Luther King Jr., thus further distinguishing his political leanings from the more conservative philosophies associated with fellow Agrarians such as Tate, Cleanth Brooks, and particularly Davidson. Warren's interviews with civil rights leaders are at the Louie B. Nunn Center for Oral History at the University of Kentucky. Warren's best-known work is All the King's Men, a novel that won the Pulitzer Prize in 1947. Main character Willie Stark resembles Huey Pierce Long (1893–1935), the radical populist governor of Louisiana whom Warren was able to observe closely while teaching at Louisiana State University in Baton Rouge from 1933 to 1942. The 1949 film by the same name was highly successful, starring Broderick Crawford and winning the Academy Award for Best Picture in 1949. There was another film adaptation in 2006 featuring Sean Penn as Willie Stark. The opera Willie Stark by Carlisle Floyd, to his own libretto based on the novel, was first performed in 1981. Warren served as the Consultant in Poetry to the Library of Congress, 1944–1945 (later termed Poet Laureate), and won two Pulitzer Prizes in poetry, in 1958 for Promises: Poems 1954–1956 and in 1979 for Now and Then. Promises also won the annual National Book Award for Poetry. In 1974, the National Endowment for the Humanities selected him for the Jefferson Lecture, the U.S. federal government's highest honor for achievement in the humanities. Warren's lecture was entitled "Poetry and Democracy" (subsequently published under the title Democracy and Poetry). In 1977, Warren was awarded the St. Louis Literary Award from the Saint Louis University Library Associates. In 1980, Warren was presented with the Presidential Medal