I'm guessing about 3 minutes after the word "leader" was invented.
C'mon.
If we want to be nuanced, elected executives are supposed to be leaders.
Leaders of their departments.
Not leaders of the "people".
The President, is the leader of the Executive Branch.
A citie's Chief of Police, is the leader of that citie's police department.
A Senator, is the leader of his office..etc.