CREATE TABLE table_49264 ("Poll Source" TEXT, "Dates administered" TEXT, "Democrat: Larry LaRocco" TEXT, "Republican: Jim Risch" TEXT, "Lead Margin" FLOAT)

Which Poll Source has a Republican Jim Risch of 43%?
SELECT "Poll Source" FROM table_49264 WHERE "Republican: Jim Risch" = '43%'
SELECT "Poll Source" FROM "table_49264" WHERE "Republican: Jim Risch" = '43%'