Question: What was the date of the poll with a sample size of 496 where Republican Mike Huckabee was chosen?
SQL: SELECT "Date" FROM "2-16668557-1" WHERE "Republican" = 'Mike Huckabee' AND "Sample Size" = 496.0;

Question: What is the sample size of the poll taken on Dec 13-15, 2007 that had a margin of error of more than 4 and resulted with Republican Mike Huckabee?
SQL: SELECT AVG("Sample Size") FROM "2-16668557-1" WHERE "Republican" = 'Mike Huckabee' AND "Margin of Error" > 4.0 AND "Date" = 'Dec 13-15, 2007';

Question: Which Democrat was selected in the poll with a sample size smaller than 516 where the Republican chosen was Ron Paul?
SQL: SELECT "Democrat" FROM "2-16668557-1" WHERE "Sample Size" < 516.0 AND "Republican" = 'Ron Paul';