user: Question: Why did Robert L. Bacon (R) vacate?
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Virginia 3rd', 'Andrew Jackson Montague (D)', 'Died January 24, 1937', 'Dave E. Satterfield, Jr. (D)', 'November 2, 1937']
SQL:

assistant: SELECT "Reason for change" FROM "Table" WHERE "Vacator" = 'Robert L. Bacon (R)';