First, let me say that Mormons are no more odd than any other religious organization. Voting for Romney was certainly no more weird than voting for Nixon, Thurmond, Paul, Perot or Dubya. That said, voting for a politician based on a so-called prophecy is cuckoo-nutso. Just because the coddled fatcat politician was raised to believe he was "special" is no reason for ordinary people to eat the same bologna and call it good.
In his book Mormon Doctrine, LDS theologian Bruce R. McConkie wrote that "From time to time, accounts of various supposed visions, revelations, and prophecies are spread forth by and among the Latter-day Saints, who should know better than to believe or spread such false information. One of these false and deceptive documents that has cropped up again and again for over a century is the so-called White Horse Prophecy."
Basically, the White Horse Prophecy is a repeat of one of the tenets of Mormon doctrine set in a future time. That is to say, at some point the USA will be in Constitutional tatters, "hanging by a thread". It will turn to the LDS and like minded people to regain its Constitutional sure footedness and stride forward boldly toward its special destiny. Lots of LDS whack-a-moles, like Glenn Beck, really, really love to use the "hanging like a thread' phrase. They also like to ignore the "like minded people" portion of the prophecy when they go about predicting doom, gloom and superhero stardom for, oh, say, Half Mitt Romney.
Well, we've had our our Constitutional crises. Bill Clinton is still the most popular politician in the USA. Newt self-deported to the moon. Health care reform is now the law of the land. We certainly don't miss Dubya. The LDS has had a hand in transforming the USA in a big, big way. Speaking of the latter, in 2009 the LDS Church issued a statement saying that it is "politically neutral" and hoped that "the campaign practices of political candidates should not suggest that their candidacy is supported by or connected to the church." The Roman Catholic Church might buy a clue from this stance. The Baptists, too. If not, the USA will find itself with many more millions of citizens who choose make up their own minds on moral and political issues without the advice of clergy. This would certainly be a good thing as long as said citizens took a few civics lessons.
But, back to a certain prophecy. Mitt Romney was finally forced to recognize that he wasn't so special after all. He had to write and deliver that concession speech. The fellow on the White Horse turns out to have been Barack Hussein Obama all along. And, finally, a piece of information for those who buy horses without knowing them or loving them. There are no white horses. There are only shades of grey. All horse lovers know that. Many children do. It is after all the answer to the riddle about the color of General Grant's white horse.