Which province had a liberal party member on December 31, 2006?
CREATE TABLE "left_senate_during_the_39th_parliament" (
  "date" text,
  "name" text,
  "party" text,
  "province" text,
  "details" text
);
SELECT "province" FROM "left_senate_during_the_39th_parliament" WHERE "party"='liberal' AND "date"='december 31, 2006';