user: Question: How many districts does Donald D. Clancy represent?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Ohio 2', 'Donald D. Clancy', 'Republican', 1960.0, 'Re-elected', 'Donald D. Clancy (R) 67.4% Don Driehaus (D) 32.6%']
SQL:

assistant: SELECT COUNT("District") FROM "Table" WHERE "Incumbent" = 'Donald D. Clancy';