Jesse Walker, one of my favorite historians, provides a thoughtful and informative overview of the history, and increasing respectability, of Mormonism in the United States:
For many Americans Mormons are scary, or weird, or at least not the sort of folk you'd want marrying your first lady. Last year a Gallup poll found that 22 percent of the country would not support a Mormon candidate for president. MSNBC host Lawrence O'Donnell claimed in early April that Mormonism "was created by a guy in upstate New York in 1830 when he got caught having sex with the maid and explained to his wife that God told him to do it." Jacob Weisberg, generally a reliable barometer of center-left conventional wisdom, wrote during the run-up to the last presidential campaign that he "wouldn't vote for someone who truly believed in the founding whoppers of Mormonism."