CREATE TABLE table_16751596_12 (republican VARCHAR, dates_administered VARCHAR)

On November 14, 2007, how many different Republican: Jeff Sessions are there?
SELECT COUNT(republican) AS :_jeff_sessions FROM table_16751596_12 WHERE dates_administered = "November 14, 2007"
SELECT COUNT("republican") AS :_jeff_sessions FROM "table_16751596_12" WHERE "November 14, 2007" = "dates_administered"