Which Liberal leader has Seats won smaller than 100, and Seats in House of 215, and a % of popular vote of 43.1%?
CREATE TABLE "liberal_party_federal_electoral_results" (
  "year" text,
  "seats_in_house" real,
  "liberal_candidates" real,
  "seats_won" real,
  "seat_change" text,
  "popular_vote" real,
  "pct_of_popular_vote" text,
  "result" text,
  "liberal_leader" text
);
SELECT "liberal_leader" FROM "liberal_party_federal_electoral_results" WHERE "seats_won"<100 AND "seats_in_house"=215 AND "pct_of_popular_vote"='43.1%';