What was the election date for H. Brent Coles?
CREATE TABLE "passages" (
  "incumbent" text,
  "reason_for_vacancy" text,
  "appointed_successor" text,
  "date_of_appointment" text,
  "elected_successor" text,
  "date_of_election" text
);
SELECT "date_of_election" FROM "passages" WHERE "appointed_successor"='H. Brent Coles';