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The key to Iowa: Evangelical voters

For the Republican presidential hopefuls in Iowa, the numbers from the last few caucuses hold a simple message: win the evangelical vote to win the state.

A visitor casts their vote with a kernel of corn for presidential candidate Donald Trump in a straw poll at the Iowa State Fair, Aug. 20, 2015, in Des Moines, Iowa. (Photo by Paul Sancya/AP)
A visitor casts their vote with a kernel of corn for presidential candidate Donald Trump in a straw poll at the Iowa State Fair, Aug. 20, 2015, in Des Moines, Iowa. AP

Dante Chinni