An interesting editorial over at Catholic Exchange:

Mormon’s [sic] do believe that the Old and New Testaments — as read by traditional Christians — are packed with errors and that Mormonism is the one true faith. Mormons believe that their president is a living prophet and that faithful mortals, in the next life, can achieve godhood. Thus, Mormons reject or redefine the Trinity, teaching that this world’s Father God has both a literal body and a literal wife.

These are not the issues that obsess typical voters, but they are important to many Christian leaders who yield great influence in the public square. The Vatican, for example, refuses to recognize the validity of Mormon baptisms.

“There are valid questions that Romney will have to answer,” said veteran religion writer Richard Ostling, co-author of “Mormon America: The Power and the Promise.”

“People need to know, ‘Is this man going to take orders from Salt Lake City? Are there elements of Mormon theology that will affect public policy?’ … But before he gets to those questions, Romney may have to say, ‘We have different doctrines. We have different scriptures. … We even have different concepts of God.’ He has to know that he can’t just say, ‘We all have the same faith.’ That is not going to work.”

Real problem I have with him is his flip-flopping on abortion.  A Mormon President would be fine with me as long as he’s strong on life issues and defense (which his faith should dictate that he be.)