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_78 ( karen_handel VARCHAR, poll_source VARCHAR, john_oxendine VARCHAR )

### Question ###
What is Karen Handel polling at in the Insideradvantage poll where John Oxendine is at 15%?

### Accurate SQL ###

SELECT karen_handel FROM table_name_78 WHERE poll_source = "insideradvantage" AND john_oxendine = "15%"