Table: us_senate_polls_2008
Columns: poll_source
dates_administered
democrat_tom_harkin
republican_christopher_reed
lead_margin

Question: What were the dates administered in the Survey USA poll source where Republican Christopher Reed received 37%?
SQL: SELECT "dates_administered" FROM us_senate_polls_2008 WHERE "poll_source" = 'survey usa' AND "republican_christopher_reed" = '37%'

Question: What percentage did Republish Christopher Reed receive when the lead margin was smaller than 16?
SQL: SELECT "republican_christopher_reed" FROM us_senate_polls_2008 WHERE "lead_margin" < 16

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%?
SQL: SELECT "dates_administered" FROM us_senate_polls_2008 WHERE "lead_margin" < 39 AND "republican_christopher_reed" = '37%' AND "democrat_tom_harkin" = '53%'

Question: What was Democrat: Tom Harkin's percentage when the poll source was Rasmussen Reports and the lead margin was 14?
SQL: SELECT "democrat_tom_harkin" FROM us_senate_polls_2008 WHERE "poll_source" = 'rasmussen reports' AND "lead_margin" = 14

Question: What were the dates administered when the lead margin was larger than 14 and the poll source was Research 2000?
SQL: SELECT "dates_administered" FROM us_senate_polls_2008 WHERE "lead_margin" > 14 AND "poll_source" = 'research 2000'