Which poll source has a lead of 17?
CREATE TABLE table_name_87 (
    poll_source VARCHAR,
    lead_margin VARCHAR
)
SELECT poll_source FROM table_name_87 WHERE lead_margin = 17
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which poll source has a lead of 17? ### Input: CREATE TABLE table_name_87 (
    poll_source VARCHAR,
    lead_margin VARCHAR
) ### Response: SELECT poll_source FROM table_name_87 WHERE lead_margin = 17