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_43586 ( "Poll Source" text, "Dates administered" text, "Democrat: Mary Landrieu" text, "Republican: John Kennedy" text, "Lead Margin" real )

### Question ###
Which organization administered the poll that showed a lead margin of 5.5?

### Accurate SQL ###

SELECT "Poll Source" FROM table_43586 WHERE "Lead Margin" = '5.5'