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On the campaign trail, GOP presidential candidate Rick Santorum often discusses his opposition to abortion rights and gay marriage. That message served him well in Iowa with its large contingent of evangelical voters. Christian conservatives are also dominant in South Carolina, which votes Saturday. Santorum hopes to repeat his Iowa performance, but he's been struggling to keep pace in polls.

GOP presidential campaigns and superPACs have been spending millions of dollars on TV and radio advertising ahead of Saturday's South Carolina primary. While the negative superPAC ads air, the candidates are delivering a more positive message.

Newt Gingrich's swift rise has been fueled by one thing above all — his forceful performances in the debates. And Thursday night, Gingrich was dominant from the start when he got the first question. It was about an explosive television interview with his ex-wife Marianne.

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DAVID GREENE, HOST:

As Mara just mentioned, the debate last night opened with a question about a claim made by Gingrich's ex-wife. Well, Marianne Gingrich gave her exclusive interview to ABC's "Nightline," putting the candidate's personal life in the spotlight once again. NPR's Tamara Keith has more.

TAMARA KEITH, BYLINE: The interview was incredibly hyped, in part because Marianne Gingrich has been silent so far on her ex-husband's presidential candidacy. This was her first television interview since their 1999 divorce.

The Iowa Republican Party has certified the results of its caucuses earlier this month. Rick Santorum is 34 votes ahead, but the party will not declare a winner because there are missing results in eight precincts. Before the certification process, Mitt Romney had been declared the winner.

Saturday is South Carolina's Republican presidential primary. It's also the second anniversary of the Supreme Court's famous Citizens United decision.

That's the case that allows corporations to explicitly support or attack specific candidates. The day will be marked with attack ads — and protests.

The Republican presidential race has covered just three states so far. And superPACs linked to candidates Mitt Romney, Newt Gingrich, Rick Santorum and Ron Paul have spent a total of $20 million. They're feeding voters a heavy diet of negativity.

The last Republican presidential debate before Saturday's South Carolina primary was expected to be lively. It didn't disappoint.

It was clear, even before the four remaining candidates met on the stage in Charleston, SC, that at least three of them would face some fairly high-stakes moments that could change the course of the contest. The question going into the debate was would they be able to master those moments?

In 1999, Rene Foreman was diagnosed with esophageal cancer. She underwent surgery that saved her life; it also took her voice box. To speak, Rene now uses an electrolarynx — a small device that she holds against her throat to produce her voice, electronically.

Discussing how having a synthesized voice has changed her life, Rene, 70, told her daughter Michelle that the electrolarynx helps her to enjoy each day, even if it also makes her stand out in some ways.

Of those times, Michelle asks, "How do you feel when people turn around and look at you?"

When a pro-democracy movement took to the streets of Morocco last February, King Mohammed VI, who's been on the throne for more than decade, responded swiftly.

Within weeks, the king proposed a new constitution and snap elections. The Moroccan example of reforms without violence was hailed by some as a model.

Millions of homeowners are finding out that their property taxes are either holding steady or climbing, even as their house may be worth much less. There may not be much they can do about it.

In Ohio, Cuyahoga County's fiscal officer, Wade Steen, has been taking many calls from unhappy homeowners. He says they most often live in a community where voters passed a recent levy. That's a property tax measure that boosts funding for things such as schools and libraries.

If you listen to commercial radio, this is not news: Katy Perry had a huge year. She went No.1 five times. She was the most played artist on the radio. But the record industry is so weird, it's hard to know whether this kind of success translates into huge amounts of money.

So we asked.

I walked over to Katy Perry's record label. She's on Capital, which is under EMI. I met Greg Thompson, executive vice president of marketing and promotion at EMI.

"Did you guys end up in the black?" I asked.

The U.S. Food and Drug Administration has a gathered a group of scientists and other experts to study flavored melt-in-your-mouth tobacco products.

The panel, meeting this week, will hear from two camps of stop-smoking advocates: those who worry that dissolvables are a gateway to smoking and others who say they help people kick the habit.

Gregory Conley, a 24-year-old law student at Rutgers University, pops a dissolvable during class or while he's studying.

Whenever the late New York Times caricaturist Al Hirschfeld sketched Carol Channing — whether picturing her as an indomitable Dolly Levi, swathed in feathers and sequins, or as carbon-crazed Lorelei Lee, eyes sparkling like the diamonds that were that splendid creature's best friends — he always made her appear a creature composed entirely of lipstick, mascara and hairspray.

Megaupload, one of the world's most popular file-sharing sites, was shut down Thursday as its founder and several executives were charged with violating piracy laws by the U.S. Department of Justice. As a technology used to transfer files too large to be sent by email, Megaupload has perfectly legitimate uses, but the Motion Picture Association of America claims that most of the content transferred over the site violates U.S. copyright laws.

Earlier today, the Justice Department announced it had charged seven people on counts of copyright infringement and conspiracy in what's being called one the biggest criminal copyright cases.

NPR's Carrie Johnson filed this report for our Newscast unit:

"The Justice Department accused Megaupload, a popular file sharing site, with helping millions of people gain access to pirated movies, music and TV programs, often before the items are released for sale.

The correct answer is mental illness.

Mental illnesses are among the most common health problems facing Americans, with 20 percent of adults having a diagnosable mental, behavioral, or emotional disorder. That's according to a new report from the Substance Abuse and Mental Health Services Administration.

Microsoft is under fire this week over a patent it was granted that's been dubbed the "avoid ghetto" feature for GPS devices.

Freestyle skiing pioneer Sarah Burke died this morning at the University of Utah Medical Center from injuries suffered nine days ago while practicing the sport she championed.

"Sarah passed away peacefully surrounded by those she loved," says a statement from the medical center. "In accordance with Sarah's wishes, her organs and tissues were donated to save the lives of others."

NPR's Arnie Seipel came upon something unexpected in Charleston, S.C. and he sent this picture of it:

Yep. The Cain Train is back in South Carolina and he's getting help from comedian Stephen Colbert, who as we've noted, announced his intention to run for President of South Carolina.

What do you do with a 1,000-foot wreck that's full of fuel and half-submerged on a rocky ledge in the middle of an Italian marine sanctuary? Remove it. Very carefully.

The wreck of the cruise liner Costa Concordia, which ran aground last week, is not unlike a car accident. The first order of business is determining whether it's worth repairing or it gets junked. Then there are the questions of how best to go about it – and who pays.

Remember that movie Sarah's Key? Did you miss it? It was last year's highest grossing foreign-language film, but it made less than eight million dollars. The fact is that selling foreign language films to U.S. audiences is a notorious challenge. Nevertheless, Fox, one of the world's most powerful media conglomerates, is beefing up its investment in foreign films.