CREATE TABLE table_name_84 (sample_size VARCHAR, date_s__administered VARCHAR)

How many people were surveyed in the poll from June 30, 2010?
SELECT sample_size FROM table_name_84 WHERE date_s__administered = "june 30, 2010"
SELECT "sample_size" FROM "table_name_84" WHERE "date_s__administered" = "june 30, 2010"