An ad attacking Newt Gingrich for his marital infidelity was launched by a conservative Christian group on Friday.

The ad arrives just as Gingrich has begun sounding optimistic about his chances of becoming the GOP nominee for president.

“I'm going to be the nominee,” Gingrich told ABC News this week. “I mean, it's very hard to look at the recent polls and think that … the odds are very high I'm going to be the nominee.”

The 3-minute ad, produced by the anonymous group Iowans for Christian Leaders in Government, begins with video of Gingrich saying he's a strong proponent of family earlier this month at a Republican debate.

“If you go back to your district and you find people who have been here 25 years and have two generations of family and have been paying taxes and are in a local church, as somebody who believes strongly in family, you're going to have a hard time explaining why that particular subset is being broken up and forced to leave,” Gingrich said in answering a question on illegal immigration.

The ad goes on to question the veracity of Gingrich's statement by pointing out that the former speaker has been divorced twice, married three times, and was involved in an extramarital affair at the same time he was leading the charge against President Bill Clinton for having an affair with Monica Lewinsky.

Richard Land of the Southern Baptist Convention is quoted as saying, “Was there hypocrisy involved? Of course there was. And it needs to be called for what it is. Hypocrisy.” (The video is embedded in the right panel of this page. Visit our video library for more videos.)

Not addressed in the ad is Gingrich's support for the Defense of Marriage Act (DOMA), the 1996 law that bars federal agencies and the military from recognizing the legal marriages of gay and lesbian couples, which was approved during his tenure as speaker of the House.

Recently, Gingrich called marriage equality “a temporary aberration that will dissipate.”