I believe that Glenn Beck's desire, in some measure, was to create a "King Benjamin moment." The Book of Mormon relates a landmark gathering of some of the ancient inhabitants of the Americas to hear the words of one King Benjamin. Benjamin declared principles of piety, humility, service, and faith to his people. He preached to them repentance and faith in Jesus Christ, who would be born in centuries to come, relative to his time. The result was a turning back to God by his audience that brought the Holy Spirit upon them. It was a moment of national renewal and personal recommitment to do good in God's name. This was Beck's template for the event that took place today.
So much for the political rally ~!
Or, perhaps Glenn hopes to don the mantle described here by Joseph Smith:
Every man who has a calling to minister to the inhabitants of the world was ordained to that very purpose in the Grand Council of heaven before this world was. [1] I suppose that I was ordained to this very office in that Grand Council. It is the testimony that I want that I am God's servant, and this people His people. The ancient prophets declared that in the last days the God of heaven should set up a kingdom which should never be destroyed, [2] nor left to other people; and the very time that was calculated on, this people were struggling to bring it out... I calculate to be one of the instruments of setting up the kingdom of Daniel by the word of the Lord, and I intend to lay a foundation that will revolutionize the whole world.
(History of the Church 6:364-5)