Noun
leader of the free world (plural leaders of the free world)
(US) The president of the United States.
President Obama vs. Lil’ Spidey in most adorable fight everEven the Leader of the Free World (and Time magazine’s Person of the Year) is no match for the cuteness that is pint-sized Spider-Man, as demonstrated in this photo from … Source: Internet
The effect that the above passage has on undecided voters is it gets them thinking, "Hey, it turns out that this Romney guy isn't too far off from the policies of the Leader of the Free World. Source: Internet