CREATE TABLE table_16751596_5 (lead_margin NUMBER, dates_administered VARCHAR2)

what is the maximum lead margin on august 5, 2008?
SELECT MAX(lead_margin) FROM table_16751596_5 WHERE dates_administered = "August 5, 2008"
SELECT MAX("lead_margin") FROM "table_16751596_5" WHERE "August 5, 2008" = "dates_administered"