user: Question: What district was John Porter elected in?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Illinois 3', 'Bill Lipinski', 'Democratic', 1982.0, 'Re-elected', 'Bill Lipinski (D) 72.5% Robert Marshall (R) 27.5%']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Incumbent" = 'John Porter';