Reporting from Ames, Iowa — For most of his two decades as a preacher, Iowa pastor Mike Demastus eschewed partisanship, telling colleagues and congregants that "religion and politics don't mix."

But there he was last month in Ames, making his way across the festive grounds of the Republican presidential straw poll, mingling with political operatives and candidates as he spoke openly about his preference for Rep. Michele Bachmann of Minnesota.

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