When Mitt Romney makes his appearance at Ralph Reed’s Faith & Freedom Conference Friday evening in Washington, he won’t exactly be headed into the lion’s den -- but it might seem that way to him. A Pew Research study released on Thursday showed that Romney has the most potential appeal of any candidate in the GOP field for 2012. But the key word there is "potential." Twenty-five percent of all voters say they would be less likely to support a candidate who is Mormon, like Romney. And a full third of white evangelicals express an aversion to Mormon candidates.