I want the tsongas of may 22, 2007
CREATE TABLE "democratic_primary" (
  "source" text,
  "date" text,
  "donoghue_d" text,
  "eldridge_d" text,
  "finegold_d" text,
  "miceli_d" text,
  "tsongas_d" text
);
SELECT "tsongas_d" FROM "democratic_primary" WHERE "date"='may 22, 2007';