I agree.
I am currently reading Irvin Stone's classic work on the settling of the American West, Men to Move My Mountains. The book discusses Joseph Smith's ambitious plans to found a Mormon empire that would stretch Westward to California. Smith was an autocrat who tolerated no dissension, and forced his people to accept polygamy. The book records the heart-wrenching devastation of Mormon women who saw their husbands turn their affections to their new young brides. Were it not for the rising up of righteous (Christian) indignation by the rest of the country, Mormons would be practicing polygamy today.
Those familiar with the bizarre world-view of Mormonism, with its evolving "Godhead" and promise of future divinity on another planet to faithful Mormons - and its relegation of Jesus to "Satan's brother" and a minor son of a god of this planet - are very understandably concerned about what a Mormon president would mean for the country.
It is worth mentioning that Romney is by no means a "jack Mormon" (non-practicing Mormon in name only). He is a bishop in the LDS church, and served as a "missionary" in his youth. Thus his commitment to Mormonism runs very deep.
Despite serious theological disagreements, I would consider voting for a Mormon who demonstrated genuine conservative, pro-family positions - over Obama, at least. However, in Romney's case, his active Mormonism combined with his liberal economic and anti-family positions as well as his shady history at Bain Capital mark him as a shameless opportunist who will do anything to secure the GOP nomination.
Finally, here's a question crying out for an answer: what percentage of Romney's campaign staff are Mormon, and how are Mormon groups and individuals aiding and abetting his campaign behind the scenes?