user: Question: Which district has an incumbent of Sanford Bishop?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Georgia 1', 'Jack Kingston', 'Republican', 1992.0, 'Re-elected', 'Jack Kingston (R) 68.5% Jim Nelson (D) 31.5%']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Incumbent" = 'Sanford Bishop';