What is the Mary Davis with a Gay Mitchell that is 4.6%?
CREATE TABLE "first_preference_votes_by_constituency" (
  "constituency" text,
  "michael_d_higgins" text,
  "se_n_gallagher" text,
  "martin_mc_guinness" text,
  "gay_mitchell" text,
  "david_norris" text,
  "dana_rosemary_scallon" text,
  "mary_davis" text
);
SELECT "mary_davis" FROM "first_preference_votes_by_constituency" WHERE "gay_mitchell"='4.6%';