Fulfilling Mormon prophecy?

Floyd Bass, ex-Mormon, said this in a comment on this blog:

The Mormons (especially the early ones) believe that the U.S. Constitution was inspired by their god for the main purpose of providing a country in which Mormonism could flourish.

They also believe (somewhat unofficially, but Joe Smith or Brigham Young said it, which makes it almost inspired) that when the Constitution was ‘hanging by a thread’ (whatever that means) that a Mormon would assume some kind of high office in this country and rescue it. This event is a precursor to their Jesus’ return to establish a 1000-year earthly kingdom (I suppose he would become president? King of the U.S.?).
Draw what conclusion you will from this.

Can anyone confirm this? Would a Romney presidency be a fulfillment of Mormon prophecy?