Table: governor_changes_2
Columns: state_class
vacator
reason_for_change
successor
date_of_successors_formal_installation

Question: Name the vacator for failure to elect
SQL: SELECT "vacator" FROM governor_changes_2 WHERE "reason_for_change" = 'Failure to elect'

Question: Name the state class for  iowa admitted to the union december 28, 1846
SQL: SELECT "state_class" FROM governor_changes_2 WHERE "reason_for_change" = 'Iowa admitted to the Union December 28, 1846'