Some members of the Church of Jesus Christ of Latter Day Saints have been bracing for a public feud over their faith ever since Mitt Romney first ran for president. What they surely didn’t expect was that it would be generated by a fellow Mormon, Senate Majority Leader Harry Reid. He claimed this week that Romney has “sullied” the Mormon faith with his “47 percent” comments. Mormons, said Reid, have a mandate to help the needy. But that doesn’t require an automatic commitment to federal spending programs. Reid was wrong on substance, but also in his approach: Inviting a conversation about Mormon teachings at this stage of the campaign can only serve to fire up critics of Mormonism. Whatever his intentions, Reid’s comments were off base.