Which Poll Source has a Republican Jim Risch of 43%?
CREATE TABLE "opinion_polling_for_the_united_states_se" (
  "poll_source" text,
  "dates_administered" text,
  "democrat_larry_la_rocco" text,
  "republican_jim_risch" text,
  "lead_margin" real
);
SELECT "poll_source" FROM "opinion_polling_for_the_united_states_se" WHERE "republican_jim_risch"='43%';