user: Question: How many incumbents were the result of Sanford Bishop (D) 57% Joseph McCormick (R) 43%?
Columns: ['District', 'Incumbent', 'Party', 'Elected', 'Status', 'Result']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ["Georgia's 1st", 'Jack Kingston', 'Republican', 1992.0, 'Re-elected', 'Jack Kingston (R) unopposed']
SQL:

assistant: SELECT COUNT("Incumbent") FROM "Table" WHERE "Result" = 'Sanford Bishop (D) 57% Joseph McCormick (R) 43%';