Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_49517 ( "Poll Source" text, "Dates administered" text, "Democrat: Vivian Davis Figures" text, "Republican: Jeff Sessions" text, "Lead Margin" real )

### Question ###
What is the poll source for Vivian Davis Figures at 29% and a lead margin greater than 27?

### Accurate SQL ###

SELECT "Poll Source" FROM table_49517 WHERE "Lead Margin" > '27' AND "Democrat: Vivian Davis Figures" = '29%'