question: When was the first elected when the party was republican and the candidate were robert h. michel (r) 66.1% rosa lee fox (d) 33.9%?
answer: SELECT MIN(first_elected) FROM table_1341718_14 WHERE party = "Republican" AND candidates = "Robert H. Michel (R) 66.1% Rosa Lee Fox (D) 33.9%"
context: CREATE TABLE table_1341718_14 (first_elected INTEGER, party VARCHAR, candidates VARCHAR)