Who, in The Lord of the Rings, was the most effective liar?

[Boromir88]

But let me just ask you "the defenders of Saruman" how on earth do you come to an outcome where Saruman is the most effective liar if he himself is completely fooled by Sauron?~Nogrod

How can Sauron be the 'most effective liar' if he is completely fooled by Gandalf et all? The 'effective' deceivers get deceived themselves.

But anyway, I disagree that Sauron was the one who fooled Saruman...Saruman wore some boots that were too big and deceived himself. Sauron just used it to his advantage.