user: Question: Which Leader has Spoilt votes as % of Seats?
Columns: ['Party', 'Leader', 'Seats', '% of seats', 'First Pref votes', '% FPv']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Fianna Fáil', 'Bertie Ahern', '77', '46.6', '858,565', '41.56']
SQL:

assistant: SELECT "Leader" FROM "Table" WHERE "% of seats" = 'Spoilt votes';