Yossi Feintuch: What went wrong with the espionage mission?

Moses — in this weekly Torah portion Sh’lach – finds it necessary to include 12 tribal leaders in the scouting-of-the-Promised-Land adventure for the sake of being politically correct, rather than be militarily correct

Yossi Feintuch: On No! and Yes! leaders

Why did Moses send twelve scouts, or 12 tribal leaders, to tour the Promised Land before entering it?  Twelve is too large a number of folks who go on an espionage mission and must, therefore, stay covert.