What was the percentage for Republican: Dino Rossi when Democrat: Christine Gregoire polled at 53.7% and the lead margin was larger than 7?
CREATE TABLE "opinion_polling_for_the_united_states_gu" (
  "source" text,
  "dates_administered" text,
  "democrat_christine_gregoire" text,
  "republican_dino_rossi" text,
  "lead_margin" real
);
SELECT "republican_dino_rossi" FROM "opinion_polling_for_the_united_states_gu" WHERE "lead_margin">7 AND "democrat_christine_gregoire"='53.7%';