CREATE TABLE table_42114 ("Source" TEXT, "Date" TEXT, "Clinton" TEXT, "Obama" TEXT, "Undecided" TEXT)

Which Source has a Clinton of 39% and a Undecided of 7%?
SELECT "Source" FROM table_42114 WHERE "Clinton" = '39%' AND "Undecided" = '7%'
SELECT "Source" FROM "table_42114" WHERE "Clinton" = '39%' AND "Undecided" = '7%'