CREATE TABLE table_75640 ("Poll Source" CLOB, "Date" CLOB, "Candidate" CLOB, "Support" CLOB, "Consider" CLOB, "Oppose" CLOB, "Unsure" CLOB)

What percentage of people were opposed to the candidate based on the WNBC/Marist poll that showed 8% of people were unsure?
SELECT "Oppose" FROM table_75640 WHERE "Unsure" = '8%' AND "Poll Source" = 'wnbc/marist poll'
SELECT "Oppose" FROM "table_75640" WHERE "Poll Source" = 'wnbc/marist poll' AND "Unsure" = '8%'