"It's Mormon lore, a story passed along by some old-timers about the importance of their faith and their country.
"In the latter days, the story goes, the U.S. Constitution will hang by a thread and a Mormon will ride in on a metaphorical white horse to save it. The Church of Jesus Christ of Latter-day Saints says it does not accept the legend - commonly referred to as the "White Horse Prophecy" - as doctrine.
"The issue, however, has been raised on those occasions when Mormons have sought the Oval Office: George Romney was asked about it during his bid in 1968, Sen. Orrin Hatch discussed it when he ran in 2000, and now Mitt Romney..."
Read more at Romney candidacy has resurrected last days prophecy of Mormon saving the Constitution