Mitt Romney's new Iowa TV advertisement highlights his steadiness and constancy both in business and as a family man, inviting sharp contrast with the thrice-married Newt Gingrich, who polls show has a sizable lead over Romney among likely voters in next month's Iowa Caucus.

The commercial features photos of the Romney family, emphasizing Romney's 42-year marriage to his wife Ann, and the candidate's own words from last month's CNBC debate. The commercial marks a new phase in the GOP presidential nomination campaign, one focused more on character issues than their policy differences, according to an Associated Press story.

The ad is a "clear shot across the bow" by Romney and a "not-so-subtle swipe at Gingrich," wrote Washington Post Election 2012 blogger Nia-Malika Henderson.

The 30-second ad will run in Iowa and New Hampshire, Henderson reported.