user: Question: What is the percentage of Perdue when McCrory has 37% and Munger has 6%?
Columns: ['Poll Source', 'Dates administered', 'Democrat: Beverly Perdue', 'Republican: Pat McCrory', 'Libertarian: Michael Munger', 'Lead Margin']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Rasmussen Reports', 'October 23, 2008', '47%', '51%', 'not an option', 4.0]
SQL:

assistant: SELECT "Democrat: Beverly Perdue" FROM "Table" WHERE "Republican: Pat McCrory" = '37%' AND "Libertarian: Michael Munger" = '6%';