“Sesame Street” is one of television’s most enduring programs, having educated and entertained children for decades. WKAR-TV airs “Sesame Street” at 10 a.m. and 2 p.m. weekdays and at 9 a.m. on weekends. Next week, one of the show’s stars will visit sixlibrariesaround Lansing.Current State’s Scott Pohl talked with Roscoe Orman, who has played Gordon for 41 seasons.