CREATE TABLE "match_up_summary" (
  "district" real,
  "incumbent" text,
  "2008_status" text,
  "democratic" text,
  "republican" text
);

Question: How many districts featured the democrat nicholas von stein?
SQL: SELECT COUNT("district") FROM "match_up_summary" WHERE "democratic"='nicholas von stein';

Question: Which incumbent's democratic candidate was mike carroll?
SQL: SELECT "incumbent" FROM "match_up_summary" WHERE "democratic"='mike carroll';