user: Question: what's the district with result being New seat Democratic gain
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Florida 2', 'Don Fuqua', 'Democratic', '1962', 'Re-elected', 'Don Fuqua (D) 61.7% Ron McNeil (R) 38.3%']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Result" = 'New seat Democratic gain';