Table: territory_leaders
Columns: district
vacator
reason_for_change
successor
date_successor_seated

Question: Name the reason for change for jonathan jennings
SQL: SELECT COUNT("reason_for_change") FROM territory_leaders WHERE "successor" = 'Jonathan Jennings'

Question: Name the date successor seated for failure to elect
SQL: SELECT "date_successor_seated" FROM territory_leaders WHERE "reason_for_change" = 'failure to elect'