CREATE TABLE table_51070 ("Poll Source" TEXT, "Dates administered" TEXT, "Democrat: Jay Nixon" TEXT, "Republican: Kenny Hulshof" TEXT, "Lead Margin" FLOAT)

What are the dates where Hulshof had 37% and Nixon had 48%?
SELECT "Dates administered" FROM table_51070 WHERE "Republican: Kenny Hulshof" = '37%' AND "Democrat: Jay Nixon" = '48%'
SELECT "Dates administered" FROM "table_51070" WHERE "Democrat: Jay Nixon" = '48%' AND "Republican: Kenny Hulshof" = '37%'