user: Question: Name the average Lead Margin on  November 13-November 19, 2007?
Columns: ['Poll Source', 'Dates administered', 'Democrat: Larry LaRocco', 'Republican: Jim Risch', 'Lead Margin']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['Research 2000/Daily Kos', 'September 16-September 17, 2008', '33%', '56%', 23.0]
SQL:

assistant: SELECT AVG("Lead Margin") FROM "Table" WHERE "Dates administered" = 'November 13-November 19, 2007';