CREATE TABLE table_16751596_5 (democrat VARCHAR, dates_administered VARCHAR)

what is the percentage for john kerry and dates administered is april 22, 2008?
SELECT democrat AS :_john_kerry FROM table_16751596_5 WHERE dates_administered = "April 22, 2008"
SELECT "democrat" AS :_john_kerry FROM "table_16751596_5" WHERE "April 22, 2008" = "dates_administered"