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_49513 ( "Poll Source" text, "Dates administered" text, "Democrat: Vivian Davis Figures" text, "Republican: Jeff Sessions" text, "Lead Margin" real )

### Question ###
What is the poll source when Jeff Sessions is at 58% and the date administered is July 31, 2008?

### Accurate SQL ###

SELECT "Poll Source" FROM table_49513 WHERE "Republican: Jeff Sessions" = '58%' AND "Dates administered" = 'july 31, 2008'