CREATE TABLE table_45519 ("Poll Source" CLOB, "Dates administered" CLOB, "Democrat: Tom Harkin" CLOB, "Republican: Christopher Reed" CLOB, "Lead Margin" FLOAT)

What were the dates administered in the Survey USA poll source where Republican Christopher Reed received 37%?
SELECT "Dates administered" FROM table_45519 WHERE "Poll Source" = 'survey usa' AND "Republican: Christopher Reed" = '37%'
SELECT "Dates administered" FROM "table_45519" WHERE "Poll Source" = 'survey usa' AND "Republican: Christopher Reed" = '37%'