Republican presidential candidate Mitt Romney sought on Saturday to calm fears that his Mormon faith would be an obstacle to evangelical Christian voters, stressing shared conservative values while acknowledging religious differences. In a speech at conservative Christian Liberty University—where it is taught that Mormonism is a cult—Romney stressed their common goal of service to God and declared his opposition to gay marriage, a position essential for winning the majority of evangelicals in November. "People of different faiths like yours and mine, sometimes wonder where we can meet in common purpose, when there are so many differences in creed and theology,"...