On what date was James P. Buchanan (d)'s successor seated?
CREATE TABLE table_2159547_3 (
    date_successor_seated VARCHAR,
    vacator VARCHAR
)
SELECT date_successor_seated FROM table_2159547_3 WHERE vacator = "James P. Buchanan (D)"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: On what date was James P. Buchanan (d)'s successor seated? ### Input: CREATE TABLE table_2159547_3 (
    date_successor_seated VARCHAR,
    vacator VARCHAR
) ### Response: SELECT date_successor_seated FROM table_2159547_3 WHERE vacator = "James P. Buchanan (D)"