What was Kaine's (D) percentage in the poll on september 19, 2005?
CREATE TABLE "opinion_polls" (
  "source" text,
  "date" text,
  "kaine_d" text,
  "kilgore_r" text,
  "potts_i" text
);
SELECT "kaine_d" FROM "opinion_polls" WHERE "date"='september 19, 2005';