Question: If the district is Virginia 8, who is the Incumbent?
SQL: SELECT "Incumbent" FROM "1-2668416-18" WHERE "District" = 'Virginia 8';

Question: If the district is Virginia 17, who are the candidates?
SQL: SELECT "Candidates" FROM "1-2668416-18" WHERE "District" = 'Virginia 17';

Question: In how many different parts was the incumbent Abraham B. Venable?
SQL: SELECT COUNT("Party") FROM "1-2668416-18" WHERE "Incumbent" = 'Abraham B. Venable';