It involves the "white horse prophesy" Desert dude. The story goes that in a time of great strife in America someone from the Mormon church will be selected to lead the country out of chaos. It is conjectured that Romney saw himself as the anointed one and he went as a reluctant hero having been called by God, he didn't necessarily WANT to do it. "Lord let this cup pass"
This would serve to explain why he actually expected to win in spite of the realtiy he was faced with, he may have believed that God would intervene and make him president because it was ordained. This is the only explaination for why he may not have really wanted to be president but being a man of God, agreed to serve anyway.