CREATE TABLE table_16751596_13 (dates_administered VARCHAR, poll_source VARCHAR)

When the poll source is research 2000/daily kos, what is the total number of dates administered?
SELECT COUNT(dates_administered) FROM table_16751596_13 WHERE poll_source = "Research 2000/Daily Kos"
SELECT COUNT("dates_administered") FROM "table_16751596_13" WHERE "Research 2000/Daily Kos" = "poll_source"