It can't be ignored that, in particular, Evangelicals have a certain amount of problem with Mormonism. They don't think it's a Christian religion. They liken it to a cult.
Fine for them. They believe in one thing. They think believing in that thing is rather important. Mitt believes in other stuff. Stuff they don't believe in. Kudos to Candy Crowley for telling us the dirty little secret that some people who believe in one religion don't like people who don't believe in their religion and certainly don't necessarily want them to be president even though they're all "people of faith."