Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which Liberal leader has Seats won smaller than 100, and Seats in House of 215, and a % of popular vote of 43.1%?

### Inputs:
table_name: table, columns: ['Year', 'Seats in House', 'Liberal candidates', 'Seats won', 'Seat Change', 'Popular vote', '% of popular vote', 'Result', 'Liberal leader']

### Response:
SELECT Liberal leader FROM table WHERE Seats won < 100 AND Seats in House = 215 AND % of popular vote = 43.1%