user: Question: Which was the district that had first elected greater than 2006 and is Democratic?
Columns: ['District', 'Counties Represented', 'Delegate', 'Party', 'First Elected', 'Committee']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['27.1 27A', "Calvert , Prince George's", 'Proctor, James E. Jr. James E. Proctor, Jr.', 'Democratic', 1990.0, 'Appropriations (Vice-Chair)']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Party" = 'Democratic' AND "First Elected" > 2006.0;