Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_45521 ( "Poll Source" text, "Dates administered" text, "Democrat: Tom Harkin" text, "Republican: Christopher Reed" text, "Lead Margin" real )

### Question ###
What were the dates administered when the lead margin was smaller than 39 with Republican Christopher Reed at 37% and Democrat Tom Harkin at 53%?

### Accurate SQL ###

SELECT "Dates administered" FROM table_45521 WHERE "Lead Margin" < '39' AND "Republican: Christopher Reed" = '37%' AND "Democrat: Tom Harkin" = '53%'