There is Rick Perry, a stained-glass window and a large illuminated cross over his right shoulder, looking more preacher than politician. An aerial shot of a soaring church steeple zooms into focus a few seconds later. Then — blink and you’ll miss it — a picture of Mr. Perry, the Texas governor, with his arm around Mike Huckabee flashes on the screen.

In more overt ways than ever, Republican candidates vying for support from Iowa caucusgoers are turning to religious language and imagery in their advertisements, seeking to appeal to the Christian conservative base that will play a pivotal role in determining the victor here.

Gone are the suggestive and supposedly subliminal images of campaigns past, as when Mr. Huckabee caused a stir in 2007 after releasing a commercial that appeared to show a cross floating in the background.

The new, more pointed religious references reflect how campaigns are scrambling for support among evangelicals who are still divided over whom to support as the caucuses near.

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