Who was the subject for the year of 2007?
CREATE TABLE "fairfax_county_board_of_supervisors_resu" (
  "year" text,
  "subject" text,
  "party" text,
  "votes" real,
  "opponent" text
);
SELECT "subject" FROM "fairfax_county_board_of_supervisors_resu" WHERE "year"='2007';