The story goes that on the road to Damascus, Saul of Tarsus, who had been persecuting and killing this new breed of people known as "Christians," was himself converted to the religion by a blinding light and a voice that told him he'd soon have a new calling.
God, in other words, chose Paul (Saul?s new name), not vice versa. Mitt Romney, on the road to Washington, D.C. via Des Moines, was also blinded. While it may not have been God speaking to him, it was certainly the voice of a large group of people who sincerely believe that God tells them how to make political choices.