CREATE TABLE table_2668416_18 (incumbent VARCHAR, district VARCHAR)
SELECT incumbent FROM table_2668416_18 WHERE district = "Virginia 8"
ถ้าเขตคือเวอร์จิเนีย 8 ใครคือผู้ดำรงตำแหน่ง?
If the district is Virginia 8, who is the Incumbent?