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This Morning from CBS News, Dec. 14, 2015

Credibility battle

Des Moines Register pollster J. Ann Selzer's latest survey of Iowa Republicans shows Ted Cruz overtaking Donald Trump in the state by 10 points. Trump immediately assaulted the accuracy and credibility of the poll, but Selzer's record is impressive. So is Trump lashing out over a legitimate "bias," or is he just dealing with bad news the only way he knows how?

Front line

We return to the front line near the ISIS-held city of Mosul in Iraq, to see how the Kurdish Peshmerga forces are standing up in the fight. They've become accustomed to fending off a battery of car bomb attacks launched by the extremists. Without sophisticated bomb disposal equipment available, the "Pesh" have to deal with ISIS' most deadly weapon in a much more direct manner.

"Red flags"

As officials continue to search for clues left behind in California by San Bernardino shooters Syed Rizwan Farook and his wife, Tashfeen Malik, law enforcement sources confirm to CBS News that Malik made postings on Facebook as far back as 2013 -- before she married Farook and moved to the U.S. -- that could have served as red flags. .

Peace Corp

An internal Peace Corps report exposes deep problems at the agency when it comes to health care for volunteers returning from service. Each year, some 1,400 volunteers come back sick or injured. CBS News investigates the bureaucratic maze that leaves some of them with little help or support.

Jane Fonda

Jane Fonda is up for her first Golden Globe in almost 30 years thanks to her role in the new movie "Youth." At 77, she already has seven of the prestigious awards, and two Oscars, honoring a career stretching from the silver screen to the stage. In the latest installment of our Emmy-nominated series, "Note to Self," Fonda opens up about her life behind-the-scenes .

Green money

An ambitious $100 billion plan to help poor nations cope may be the murkiest part of the Paris climate accord's huge $16.5 trillion anti-pollution tab. Challenges for the Green Climate Fund include almost no money in hand and few safeguards against waste and corruption.

Christmas commerce?

It was once anathema to think of shopping on Thanksgiving Day, but it's become almost commonplace with some major retailers opening their doors on the holiday. What's next? Christmas Day? One consulting company believes it's inevitable, and could happen sooner than you think.

More top news:

U.S.

Vandals target mosques in Southern California

Program shows teens realities of gun violence

Fire kills 5 in abandoned Fresno, Calif. house

Wing trouble forces emergency landing for Southwest jet

World

Egypt still insists no evidence Russian plane was attacked

MTV "The Challenge" copter crash kills 2 in Argentina

Paris marks 1 month since deadly terror attacks

Syrian rebels lob shells into capital city

Politics

Poll shows Clinton would beat Trump, but not Rubio or Carson

Trump: Ted Cruz is a "bit of a maniac"

Chris Christie: I don't think Trump is a "bigot"

Who will feature in the next GOP primary debate?

Business

Wall Street fears a run on junk bonds -- and worse

Lessons from Islam about smart investing

How much home does $350,000 buy?

Science and Tech

Books vs. E-books: Science behind best way to read

Who are the winners and losers of the Paris climate deal?