CREATE TABLE table_name_72 (dates_administered VARCHAR2, lead_margin VARCHAR2, poll_source VARCHAR2)

What were the dates administered when the lead margin was larger than 14 and the poll source was Research 2000?
SELECT dates_administered FROM table_name_72 WHERE lead_margin > 14 AND poll_source = "research 2000"
SELECT "dates_administered" FROM "table_name_72" WHERE "lead_margin" > 14 AND "poll_source" = "research 2000"