kakistocrat
An unprincipled person in power. An incompetant leader, or puppet of a corrupt system
After taking office, the new mayor proved to be another kakistocrat, enriching his circle of friends and letting the city fall into ruin
Kakistocrat
Viz. George W. Bush
Dubya is a kakistocrat
Kakistocratic
Relating to or supporting a Government of the worst people and its lack of moral principles.
Vladimir Putin presides over a kakistocratic mafia state.