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_48633 ( "Source" text, "Dates administered" text, "Democrat: Christine Gregoire" text, "Republican: Dino Rossi" text, "Lead Margin" real )

### Question ###
What is the source of the poll that had Republican: Dino Rossi at 46%, Democrat: Christine Gregoire at 50%, and the lead margin was larger than 3?

### Accurate SQL ###

SELECT "Source" FROM table_48633 WHERE "Republican: Dino Rossi" = '46%' AND "Lead Margin" > '3' AND "Democrat: Christine Gregoire" = '50%'