Mitt Romney has been quite circumspect when it comes to talking about his beliefs during this campaign. Via Pharyngula, this video shows Mitt Romney very aggressively defending his Mormon religious beliefs.
This interview was conducted in Iowa in August 2007 during 2008 campaign. Romney said that he did not know he was being filmed, which I can believe since it definitely does not show him in a good light. He is visibly angry and comes across as pretty obnoxious, prone to browbeating others. He looks like a guy who is used to getting his own way and will stomp on anyone in his path.
He also looks like a true believer in his religious doctrines, however crazy they may be. He even believes in the Old Testament prophecy (Zechariah 14:4) that when Jesus returns to Earth, he will stand on the Mount of Olives which will then split in two. This is pretty esoteric stuff. The book of Zechariah comes almost at the end of the OT and most people have given up reading the Bible long before they get to it, so the fact that he is aware of it suggests someone who has really bought the whole package.
Romney does not seem like a cafeteria Mormon, picking and choosing from his church’s doctrines. He may well be the most religious person to obtain a major party nomination for the presidency in the past 100 years, and I am including born-again Christian Jimmy Carter in the comparison.