DES MOINES — Television evangelist Pat Robertson shocked the political establishment here on a cold February night in 1988, coming in second in the state’s GOP caucuses, with more support than the vice president, George H.W. Bush.
Robertson’s strong showing was fueled by a so-called “invisible army’’ of evangelical followers, who surfaced just days before the vote and discovered the power they could wield.
That army is invisible no longer. In a twist, though, split loyalties within its ranks could improve the chances of a more moderate GOP candidate like Mitt Romney, who stumbled here in 2008 and has spent little time in Iowa since. The former Massachusetts governor, who makes his first 2011 visit to Iowa today and will formally announce his candidacy Thursday, is up against the fact that, over the past quarter-century, highly motivated Christian conservatives have played an outsize role in a presidential selection process here. The reason is, at least in part, that they are a highly motivated voting bloc, willing to sit through an entire evening-long caucus meeting, rather than just commit to a five-minute stop at a voting booth.

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