The Iowa pastors heard David Barton, a Christian historian, argue that the country was founded as explicitly Christian and lament that too few evangelicals get out and vote. They heard Newt Gingrich, a former House speaker and like Mr. Huckabee a possible 2012 presidential candidate, say that constitutional liberties like the right to bear arms were ordained by God. They heard how to promote “biblically informed” political advocacy by churchgoers within the confines of federal tax law.

The other possible candidates who spoke were Gov. Haley Barbour of Mississippi and Representative Michele Bachmann of Minnesota.

Support from many of the pastors in the audience here helped Mr. Huckabee, an evangelical minister, win the Iowa Republican caucuses in 2008. He had been the only candidate to appear at a pastors’ meeting before the Republican caucuses and went on to gain a surprise victory, with 60 percent of the caucus voters describing themselves in exit polls as evangelicals.

This year, many more would-be contenders are making plays for support.

Mr. Huckabee, of course, was warmly welcomed back at the event here as he declared: “We face a spiritual war in this country. Let this weekend be a time when you say, ‘We will not fail, and America will not fall.’ ”