user: Question: What district had elections in 1964?
Columns: ['District', 'Incumbent', 'Party', 'Elected', 'Status', 'Opponent']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Illinois1', 'Charles Hayes', 'Democratic', 1983.0, 'Re-elected', 'Charles Hayes (D) 93.8% Babette Peyton (R) 6.2%']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Elected" = 1964.0;