CREATE TABLE table_47883 ("Poll Source" TEXT, "Dates administered" TEXT, "Democrat: Beverly Perdue" TEXT, "Republican: Pat McCrory" TEXT, "Libertarian: Michael Munger" TEXT, "Lead Margin" FLOAT)

What is the percentage of Perdue when McCrory has 37% and Munger has 6%?
SELECT "Democrat: Beverly Perdue" FROM table_47883 WHERE "Republican: Pat McCrory" = '37%' AND "Libertarian: Michael Munger" = '6%'
SELECT "Democrat: Beverly Perdue" FROM "table_47883" WHERE "Libertarian: Michael Munger" = '6%' AND "Republican: Pat McCrory" = '37%'