CREATE TABLE table_23680576_2 (aug_2008 VARCHAR2, sep_2008 VARCHAR2)

What was the polling average in Aug 2009 when is was 5.0% in Sep 2009?
SELECT aug_2008 FROM table_23680576_2 WHERE sep_2008 = "5.0%"
SELECT "aug_2008" FROM "table_23680576_2" WHERE "5.0%" = "sep_2008"