One of the issues of modernity is the separation of character from leadership. In the past, wisdom said that character and leadership are inseparable. You can't say someone is a good leader (getting things done effectively) and yet he/she acts like an ass. Character, class, integrity, yes even moral character is more important that an effective administrator. Now, it's who cares about the person and his private life, as long as the stock market continues to go up ... let's keep him in there
.
This not only goes for the President of the USA, it goes for corporate CEO's, non-profit leaders, Civic leaders, professors, etc. As a starting point, read the Cole's notes on Plato's Republic on the definition of a leader.