What was the undecided with Roy Barnes at 47%?
CREATE TABLE "democratic_primary" (
  "poll_source" text,
  "dates_administered" text,
  "roy_barnes" text,
  "thurbert_baker" text,
  "du_bose_porter" text,
  "david_poythress" text,
  "undecided" text
);
SELECT "undecided" FROM "democratic_primary" WHERE "roy_barnes"='47%';