Minnesota Attorney General Keith Ellison last week compared Supreme Court Justice Clarence Thomas to a house slave played by Samuel L. Jackson in the 2012 film “Django Unchained.” In Quentin Tarantino’s violent black comedy about slavery in the antebellum South, Jackson portrays a character named Stephen Warren, who is loyal to the white landowner at a Mississippi plantation despite the cruelty he inflicts upon the other slaves. “Well, Clarence Thomas, anybody who’s watched the movie ‘Django,’ just watch Stephen and you see Clarence Thomas,” Ellison said in an interview last Thursday with the Detroit-based Michigan Chronicle.