Here's the Mormon apostle, Bruce R. McConkie, responding to questions as to why the ban on full African-American membership in the church was suddenly lifted in 1978:
There are statements in our literature by the early brethren which we have interpreted to mean that the Negroes would not receive the priesthood in mortality. I have said the same things, and people write me letters and say, "You said such and such, and how is it now that we do such and such?" And all I can say to that is that it is time disbelieving people repented and got in line and believed in a living, modern prophet.
Forget everything that I have said, or what President Brigham Young or President George Q. Cannon or whomsoever has said in days past that is contrary to the present revelation. We spoke with a limited understanding and without the light and knowledge that now has come into the world…. We get our truth and our light line upon line and precept upon precept. We have now had added a new flood of intelligence and light on this particular subject, and it erases all the darkness and all the views and all the thoughts of the past. They don’t matter any more…. It doesn’t make a particle of difference what anybody ever said about the Negro matter before the first day of June of this year.
Re-phrase that in a political context: It doesn't make a particle of difference what Romney ever said about any of his positions before October 3, 2012. Now get in line. The October 3 debate "erases all the darkness and all the views and all the thoughts of the past. They don’t matter any more."
(To read the whole Dish debate in one place, go to the "Religion, Race And Double Standards" thread page.)