user: Question: What was the source of the poll that gave McAuliffe 30% on June 8?
Columns: ['Source', 'Dates Administered', 'Terry McAuliffe', 'Brian Moran', 'Creigh Deeds']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Survey USA', 'June 8', '30%', '21%', '42%']
SQL:

assistant: SELECT "Source" FROM "Table" WHERE "Terry McAuliffe" = '30%' AND "Dates Administered" = 'June 8';