user: Question: How many districts have the incumbent, Charles Rangel? 
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['New York 1', 'Tim Bishop', 'Democratic', 2002.0, 'Re-elected', 'Tim Bishop (D) 62.2% Italo Zanzi (R) 37.8%']
SQL:

assistant: SELECT COUNT("District") FROM "Table" WHERE "Incumbent" = 'Charles Rangel';