Republican candidate, Rick Santorum, has already won the support of the evengelical Republican base.
Now, according to opinion polls, he is tipped to win Mitt Romney's home state, Michigan.
A Santorum win in Michigan may lead some Republicans to search for a new candidate, as some worry the former Pennsylvania senator's strong religious views could make him unelectable.
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CNN's Jonathan Mann profiles the Republican candidate and what he has said about his faith.
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