Question: On what date was the poll showing John Kennedy with 45% and Mary Landrieu with 38%?
SQL: SELECT "Dates administered" FROM "2-16751596-4" WHERE "Republican: John Kennedy" = '45%' AND "Democrat: Mary Landrieu" = '38%';

Question: What was the date of the poll from Survey USA that showed a lead margin smaller than 5.5?
SQL: SELECT "Dates administered" FROM "2-16751596-4" WHERE "Lead Margin" < 5.5 AND "Poll Source" = 'Survey USA';

Question: Which organization administered the poll that showed a lead margin of 5.5?
SQL: SELECT "Poll Source" FROM "2-16751596-4" WHERE "Lead Margin" = 5.5;

Question: Which poll shows Democrat Mary Landrieu with 53% against Republican John Kennedy?
SQL: SELECT "Republican: John Kennedy" FROM "2-16751596-4" WHERE "Democrat: Mary Landrieu" = '53%';