When the poll source is research 2000/daily kos, what is the total number of dates administered? 
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
);
SELECT COUNT("dates_administered") FROM "opinion_polling_for_the_united_states_se" WHERE "poll_source"='Research 2000/Daily Kos';