The intent of this thread is not to determine if a Mormon should be president, or if you want one as a next door neighbor, but are they Christian?
Please try to focus on that thought......
Press on! It will be clear to any rational human that Mormon doctrine is contrary to the Bible and no one can truly be a Mormon and truly be a Christian. That being said, not all who participate in “Christian churches” are not all truly Christians and it’s likely that not all who participate in Mormon churches are truly Mormons.
False doctrine must be exposed to the light of Truth, which can only be found in the revealed, written Word of God - that which has been recognized as the Bible for nearly 2,000 years.
What difference would it make whether or not a Mormon is a Christian if, as President, one agrees with your politics?
Would you prefer a Mormon who agrees with you to a Christian who disagrees with you, politically speaking, in the White House? How about a Mormon who abides by his Church's teachings, believes in Christ, etc. vs. a Christian who you have no evidence does the same?
Walter Martin's Kingdom of the Cults lays out areas in which he strongly contends that Mormonism and Christianity diverge. One chapter in that examination is entitled The Truth about the god of the Mormons, in which Martin cites written texts from the Book of Mormon, Joseph Smith, Brigham Young, and succeeding prophets.
You make it sound as though the president should have to be a Christian.
Before deciding whether we are Christians, you really should define Christian. Can you list those beliefs, practices, and characteristics that distinguish those who are Christians from those who are not?
The problem of definition is more difficult than it might appear at first. Almost any definition that would exclude Mormons would also exclude other groups that have historically been considered Christian.
You might start with the Bible. The word Christian appears in three places in the Bible: Acts 11:26; Acts 26:28; and 1 Peter 4:16. How does the Bible define the word?
Those are very different questions. For me, the answer is, unless they are willing to affirm the Nicene and Chalcedonian creeds, they are not.
That's not a judgment on them as neighbors, co-workers, or Presidents. In point of fact, I am seriously considering supporting Romney in the primaries. But I do so with the knowledge that he isn't "Christian" as historic, orthodox Christianity defines the term.
What then, is a christian?..
Phrased in this way, I believe the question is unanswerable, although several posters have made the attempt. I do not presume to know whether any specific individual, or set of individuals, is saved.
A more tractable, and important, question (which other posters have tried to answer), is this: Is Mormanism a Christian denomination, or is it a separate religion?