Table schema:
CREATE TABLE table_1341577_43 (incumbent VARCHAR, candidates VARCHAR)

Question: Who is the incumbent that is listed with the candidates listed as marilyn lloyd (d) 57.4% harold w. coker (r) 42.6%?
SQL: SELECT incumbent FROM table_1341577_43 WHERE candidates = "Marilyn Lloyd (D) 57.4% Harold W. Coker (R) 42.6%"