CREATE TABLE table_44625 ("Poll Source" TEXT, "Sample Size" FLOAT, "Margin of Error" FLOAT, "Date" TEXT, "Democrat" TEXT, "Republican" TEXT)

Where is the poll source when Hillary clinton was the democrat, john mccain was the republican, and the margin of error was less than 4.5 on May 2-7, 2007?
SELECT "Poll Source" FROM table_44625 WHERE "Democrat" = 'hillary clinton' AND "Margin of Error" < '4.5' AND "Republican" = 'john mccain' AND "Date" = 'may 2-7, 2007'
SELECT "Poll Source" FROM "table_44625" WHERE "Date" = 'may 2-7, 2007' AND "Democrat" = 'hillary clinton' AND "Margin of Error" < '4.5' AND "Republican" = 'john mccain'