CREATE TABLE table_203_43 (id DECIMAL, "polling firm" TEXT, "month" TEXT, "link" TEXT, "favor" DECIMAL, "oppose" DECIMAL)

which polling firm was the only poll done in 2008 ?
SELECT "polling firm" FROM table_203_43 WHERE "month" = 2008
SELECT "polling firm" FROM "table_203_43" WHERE "month" = 2008