On any given day in the coverage leading up to the 2012 election, you can read stories about how the candidates face those evangelicals in Iowa.

Exit polls from 2008 show that 60 percent of voters in the G.O.P. Iowa caucuses and in the South Carolina primary were evangelicals. And since a large number of evangelicals say they don’t plan to vote for a Mormon, that raises questions for Mitt Romney’s ability to excite primary voters.

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