What percentage did kennedy win while coakly won 37.9%
CREATE TABLE "by_county" (
  "county" text,
  "coakley_pct" text,
  "coakley_votes" real,
  "brown_pct" text,
  "brown_votes" real,
  "kennedy_pct" text,
  "kennedy_votes" real
);
SELECT "kennedy_pct" FROM "by_county" WHERE "coakley_pct"='37.9%';