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_91 ( polling_firm VARCHAR, t_papadopoulos VARCHAR )

### Question ###
Which polling firm put T. Papadopoulos at 31%?

### Accurate SQL ###

SELECT polling_firm FROM table_name_91 WHERE t_papadopoulos = "31%"