Not sure if they believe the others, but why do you care? What possible relevance do those other beliefs have to the office of the president?
Romney is running for president, not pastor.
You are wrong curiosity. Mormons DO believe that because of an unwillingness to side with the plan Jesus laid out in the pre-existence, they were indeed marked with the curse of Cain.
You are free to vote for Mitt. I will not.