In how many counties did McCain get 65.72% of the votes?
CREATE TABLE "by_county" (
  "county" text,
  "obamapct" text,
  "obamanum" real,
  "mc_cainpct" text,
  "mc_cainnum" real
);
SELECT COUNT("county") FROM "by_county" WHERE "mc_cainpct"='65.72%';