Which Overall has a College of michigan state, a Position of fb, and a Round larger than 8?
CREATE TABLE "washington_redskins_draft_history" (
  "round" real,
  "pick" real,
  "overall" real,
  "name" text,
  "position" text,
  "college" text
);
SELECT SUM("overall") FROM "washington_redskins_draft_history" WHERE "college"='michigan state' AND "position"='fb' AND "round">8;