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_38455 ( "Poll source" text, "Dates administered" text, "Roy Barnes" text, "Thurbert Baker" text, "DuBose Porter" text, "David Poythress" text, "Undecided" text )

### Question ###
What was the undecided with Roy Barnes at 47%?

### Accurate SQL ###

SELECT "Undecided" FROM table_38455 WHERE "Roy Barnes" = '47%'