How much is the lowest Operating Expenditures when Contributions are more than 8,245,241?
CREATE TABLE "democrats" (
  "candidate" text,
  "contributions" real,
  "loans_received" real,
  "all_receipts" real,
  "operating_expenditures" real,
  "all_disbursements" real
);
SELECT MIN("operating_expenditures") FROM "democrats" WHERE "contributions">'8,245,241';