user: Question: Which Date has a Remainder of 20%?
Columns: ['Source', 'Date', 'Blagojevich (D)', 'Topinka (R)', 'Remainder']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Survey USA', 'November 2, 2006', '45%', '37%', '4%']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Remainder" = '20%';