Who was the runner-up for the event that ended with a winning score of –15 (66-67-70-70=273)?
CREATE TABLE "nationwide_tour_wins_5" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "runner_s_up" FROM "nationwide_tour_wins_5" WHERE "winning_score"='–15 (66-67-70-70=273)';