Who was the successor for the state of Maine (2) ?
CREATE TABLE "table1_225099_3" (
  "state_class" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_of_successors_formal_installation" text
);
SELECT "successor" FROM "table1_225099_3" WHERE "state_class"='Maine (2)';