What is the poll source for Vivian Davis Figures at 29% and a lead margin greater than 27?
CREATE TABLE table_49517 (
    "Poll Source" text,
    "Dates administered" text,
    "Democrat: Vivian Davis Figures" text,
    "Republican: Jeff Sessions" text,
    "Lead Margin" real
)
SELECT "Poll Source" FROM table_49517 WHERE "Lead Margin" > '27' AND "Democrat: Vivian Davis Figures" = '29%'
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: What is the poll source for Vivian Davis Figures at 29% and a lead margin greater than 27? ### Input: CREATE TABLE table_49517 (
    "Poll Source" text,
    "Dates administered" text,
    "Democrat: Vivian Davis Figures" text,
    "Republican: Jeff Sessions" text,
    "Lead Margin" real
) ### Response: SELECT "Poll Source" FROM table_49517 WHERE "Lead Margin" > '27' AND "Democrat: Vivian Davis Figures" = '29%'