CREATE TABLE table_name_35 (sample_size VARCHAR2, date VARCHAR2, democrat VARCHAR2)

What was the sample size for polling on May 2-7, 2007 for Hillary Clinton?
SELECT sample_size FROM table_name_35 WHERE date = "may 2-7, 2007" AND democrat = "hillary clinton"
SELECT "sample_size" FROM "table_name_35" WHERE "date" = "may 2-7, 2007" AND "democrat" = "hillary clinton"