CREATE TABLE table_21054 ("Poll Source" CLOB, "Dates administered" CLOB, "Democrat: Carl Levin" CLOB, "Republican: Jack Hoogendyk" CLOB, "Lead Margin" FLOAT)

What poll source had an administered date on July 10, 2008?
SELECT "Poll Source" FROM table_21054 WHERE "Dates administered" = 'July 10, 2008'
SELECT "Poll Source" FROM "table_21054" WHERE "Dates administered" = 'July 10, 2008'