CREATE TABLE "opinion_polling_for_the_united_states_se" (
  "poll_source" text,
  "dates_administered" text,
  "democrat_mark_begich" text,
  "republican_ted_stevens" text,
  "lead_maragin" real
);

Question: What was the average lead maragin for the dates administered of october 6, 2008?
SQL: SELECT AVG("lead_maragin") FROM "opinion_polling_for_the_united_states_se" WHERE "dates_administered"='october 6, 2008';

Question: What was the poll source for october 6, 2008?
SQL: SELECT "poll_source" FROM "opinion_polling_for_the_united_states_se" WHERE "dates_administered"='october 6, 2008';