user: Question: What is Winner, when Circuit is June 8?
Columns: ['Circuit', 'Location', 'Date', 'Pole Position', 'Fastest Lap', 'Winner']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['March 8', 'Daytona International Speedway', 'Daytona Beach, Florida', 'Mat Mladin', 'Mat Mladin', 'Mat Mladin']
SQL:

assistant: SELECT "Winner" FROM "Table" WHERE "Circuit" = 'June 8';