user: Question: What is the name of the vacator for district Louisiana 1st?
Columns: ['District', 'Vacator', 'Reason for change', 'Successor', 'Date successor seated']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Louisiana 1st', 'Richard A. Tonry (D)', 'Forced to resign May 4, 1977', 'Bob Livingston (R)', 'August 27, 1977']
SQL:

assistant: SELECT "Vacator" FROM "Table" WHERE "District" = 'Louisiana 1st';