The usual suspects were fingered by the Republican presidential hopefuls Saturday in a forum in Iowa sponsored by an evangelical group—gay marriage, secularism, the federal government, activist judges, liberals. The attacks were warmly received by the crowd of 3,000-plus in the pews of the First Federated Church in Des Moines. But it was a line from Newt Gingrich about the Occupy Wall Street protesters that brought down the church.