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 candidate (poll_source VARCHAR)

### Question ###
Which poll resource provided the most number of candidate information?

### Accurate SQL ###

SELECT poll_source FROM candidate GROUP BY poll_source ORDER BY COUNT(*) DESC LIMIT 1