user: Question: Name the state class for Resigned November 3, 1964
Columns: ['State (class)', 'Vacator', 'Reason for change', 'Successor', 'Date of successors formal installation']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Tennessee (2)', 'Estes Kefauver (D)', 'Died August 10, 1963', 'Herbert S. Walters (D)', 'August 20, 1963']
SQL:

assistant: SELECT "State (class)" FROM "Table" WHERE "Reason for change" = 'Resigned November 3, 1964';