user: Question: How many districts does John J. Douglass represent?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Massachusetts 2', 'Henry L. Bowles', 'Republican', 1925.0, 'Re-elected', 'Henry L. Bowles (R) 64.0% John Hall (D) 36.0%']
SQL:

assistant: SELECT COUNT("District") FROM "Table" WHERE "Incumbent" = 'John J. Douglass';