What is the party when the candidates were ernest istook (r) 69% garland mcwatters (d) 28%?
CREATE TABLE "oklahoma" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" text,
  "results" text,
  "candidates" text
);
SELECT "party" FROM "oklahoma" WHERE "candidates"='Ernest Istook (R) 69% Garland McWatters (D) 28%';