SCHEMA:
CREATE TABLE table_name_86 (liberal_leader VARCHAR, _percentage_of_popular_vote VARCHAR, seats_won VARCHAR, seats_in_house VARCHAR)
USER:
Which Liberal leader has Seats won smaller than 100, and Seats in House of 215, and a % of popular vote of 43.1%?

QUERY:
SELECT liberal_leader FROM table_name_86 WHERE seats_won < 100 AND seats_in_house = 215 AND _percentage_of_popular_vote = "43.1%"