Jon Krakauer says that "Mormonism gradually ceased to be regarded as a crackpot sect."
Jon Krakauer, Under the Banner of Heaven (New York: Anchor, 2003), 7
Although LDS leaders were initially loath to abandon plural marriage, eventually they adopted a more pragmatic approach to American politics, empathically rejected the practice, and actually began urging government agencies to prosecute polygamists. It was this single change in ecclesiastical policy, more than anything else, that transformed the LDS Church into its astonishingly successful present-day iteration. Having jettisoned polygamy, Mormons gradually ceased to be regarded as a crackpot sect. The LDS Church acquired the trappings of a conventional faith so successfully that it is now widely considered to be the quintessential American religion.