CREATE TABLE table_2159547_3 (vacator VARCHAR, successor VARCHAR)

How many people vacated to successor Dave E. Satterfield, Jr. (d)?
SELECT COUNT(vacator) FROM table_2159547_3 WHERE successor = "Dave E. Satterfield, Jr. (D)"
SELECT COUNT("vacator") FROM "table_2159547_3" WHERE "Dave E. Satterfield, Jr. (D)" = "successor"