Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_2159547_3 (date_successor_seated VARCHAR, vacator VARCHAR)
### Question:
On what date was James P. Buchanan (d)'s successor seated?
### Answer:
SELECT date_successor_seated FROM table_2159547_3 WHERE vacator = "James P. Buchanan (D)"