While people were talking about the religion of former Gov. Mitt Romney at the Values Voter Summit in Washington, Romney was wrapping up a two-day swing through South Carolina. Romney finished fourth in this state's primary in 2008, and his Mormonism was one of the issues seen as holding him back. This time around, there's been less talk about religion and more about policy, but Romney still has a tough row to hoe in this early-voting state. NPR's Ari Shapiro explains why.