The White Horse Prophecy was repudiated by the LDS Church in 1918.
In December 2009, the LDS Church issued a statement in December 2009 that:
"The so-called 'White Horse Prophecy' is based on accounts that have not been substantiated by historical research and is not embraced as Church doctrine."
The history of the White Horse Prophecy is much more complicated. I'm happy to discuss that if you wish, but only in a historical context. I'm not interested in addressing LDS theology.
It is interesting that “officially” the prophesy has been refuted or dismissed, yet my large mormon family talk about it and convinced that Romney is the fulfillment of this prophesy.
So, even though “officially” dismissed, the rank and file appear to not have.