0Romney Preaches On MormonismIn a 2007 video that just went viral, the GOP candidate gets testy with a Des Moines radio host on the subject of his Mormon faith, telling him 'I understand my faith better than you do.' Watch Romney's rare display of passion for his religion.Updated Apr. 21, 2017 2:57PM EDT / Published Nov. 04, 2012 8:27PM EST Charles Krupa / AP Photo