What percentage of voters voted for a third party in the county that had 802 third party voters?
CREATE TABLE "by_county" (
  "county" text,
  "obama_pct" text,
  "obama_num" real,
  "mc_cain_pct" text,
  "mc_cain_num" real,
  "others_pct" text,
  "others_num" real
);
SELECT "others_pct" FROM "by_county" WHERE "others_num"=802;