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_name_72 ( dates_administered VARCHAR, lead_margin VARCHAR, poll_source VARCHAR )

### Question ###
What were the dates administered when the lead margin was larger than 14 and the poll source was Research 2000?

### Accurate SQL ###

SELECT dates_administered FROM table_name_72 WHERE lead_margin > 14 AND poll_source = "research 2000"