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%?
CREATE TABLE "united_states_house_of_representatives_e" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "result" text,
  "candidates" text
);
SELECT MIN("first_elected") FROM "united_states_house_of_representatives_e" WHERE "party"='Republican' AND "candidates"='Robert H. Michel (R) 66.1% Rosa Lee Fox (D) 33.9%';