what is the highest mccain # where obama got 33.7%
CREATE TABLE "by_county" (
  "county" text,
  "mc_cain_num" real,
  "mc_cain_pct" text,
  "obama_num" real,
  "obama_pct" text
);
SELECT MAX("mc_cain_num") FROM "by_county" WHERE "obama_pct"='33.7%';