Question: Who was the successor for the state of Maine (2) ?
SQL: SELECT "Successor" FROM "1-225099-3" WHERE "State (class)" = 'Maine (2)';

Question: What is the date of successors formal installation when the reason for change is Resigned December 4, 1819?
SQL: SELECT "Date of successors formal installation" FROM "1-225099-3" WHERE "Reason for change" = 'Resigned December 4, 1819';

Question: How many entries are shown for date of successors formal installation where successor is John W. Walker (DR)?
SQL: SELECT COUNT("Date of successors formal installation") FROM "1-225099-3" WHERE "Successor" = 'John W. Walker (DR)';

Question: Who was the successor for the state (class) of Maine (2)?
SQL: SELECT "Successor" FROM "1-225099-3" WHERE "State (class)" = 'Maine (2)';

Question: what is the state for reason for change is Resigned May 15, 1820?
SQL: SELECT "State (class)" FROM "1-225099-3" WHERE "Reason for change" = 'Resigned May 15, 1820';