user: Question: What was the undecided with Roy Barnes at 47%?
Columns: ['Poll source', 'Dates administered', 'Roy Barnes', 'Thurbert Baker', 'DuBose Porter', 'David Poythress', 'Undecided']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Rasmussen Reports', 'July 13, 2010', '59%', '16%', '5%', '5%', '12%']
SQL:

assistant: SELECT "Undecided" FROM "Table" WHERE "Roy Barnes" = '47%';