here's julianna goldman. >> thank you, good night, and may the force be with you. >> reporter: feeling the force hind her, a confident hillary clinton deflected attacks from bernie sanders and martin o'mally while setting her sights on the republicans, especially donald trump. >>e is becoming isis' best they are going to people, showing videos of donald trump insulting islam and muslims -- >> reporter: sunday the gop front-runner says those claims are unsubstantntted. >> another hillary lie, she lies like crazy. about everything. >> reporter: instead of personal insults democrats last night focused on policy disputes. >> our differences are fairly deep. >> reporter: most of the debate covered national security. sanders once again hit clinton on her 2003 vote to authorize the iraq war. >> secretary clinton is too much into regime change and a little bit too aggressive -- >> senator, you voted for regime change with respect to libya. >> reporter: and on the economy. >> should corporate america love hillary clinton? >> everybody should. >> they ain't going to like me, and wall street is g

here's julianna goldman. >> thank you, good night, and may the force be with you. >> reporter: feeling the force behind her, a confident hillary clinton deflected attacks from bernie sanders and martin o'mally while setting her sights on the republicans, especially donald trump. >> he is becoming isis' best recruiter. they are going to people, showing videos of donald trump insulting islam and muslims -- >> reporter: sunday the gop front-runner says those claims are unsubstantiated. >> another hillary lie, she lies like crazy. about everything. insults democrats last night focused on policy disputes. >> our differences are fairly deep. >> reporter: most of the debate covered national security. sanders once again hit clinton on her 2003 vote to authorize the iraq war. >> secretary clinton is too much into regime change and a little bit too aggressive -- >> senator, you voted for regime change with respect to libya. >> reporter: and on the economy. >> should corporate america love hillary clinton? >> everybody should. >> they ain't going to like me, and wall street is going to like me ev

here's julianna goldman. >> thank you, good night and may the force be with you. (cheers and applause) >> reporter: feeling the force behind her, a confident hillary clinton deflected attacks from bernie sanders and martin o'malley while setting her sights on the republicans, especially donald trump. >> he is becoming isis' best recruiter. they are going to people, showing videos of donald trump, insulting islam and muslims. >> reporter: on sundayed gop frontrunner says those claims >> it's just another hillary lie, she lies like crazy about everything. >> reporter: instead of personal insults, democrats last night focused on policy disputes. >> our differences are fairly deep. >> reporter: moses of the debate covered national security. sanders once again hit clinton on her 2003 vote to authorize the iraq war. >> secretary clinton is too much into regime change and a little bit too aggressive. >> reporter. >> senator, you voted for regime change with respect to libya. >> reporter: and on the economy. >> should corporate america love hillary clinton? ness everybody

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we begin with julianna goldman in washington. >> i don't go down, i go up. >> reporter: donald trump has said he only likes polls that treat him well. even before a new iowa poll showed him slipping he dismissed it as biased. >> i'm leading in virtually every state. i'm leading in iowa. although "des moines register" does a poll and i'm sure that will be negative. >> reporter: that poll conducted by one of the state's most respected and accurate pollsters. it has ted cruz surging. senator cruz has spent months courting the voters with whom he's now leading, evangelicals he's capturing supporters fleeing ben carson, who has faltered with the increased focus on national security. >> you look at the way he's dealt with the senate, where he goes in there frankly a little like a maniac. >> reporter: in the fox news interview the billionaire front-runner says cruz doesn't have the right temperament to the president. the poll of iowa republicans has the texas senator leading on that quality. on sunday trump enthusiastically tweeted out a different national poll showing him with a new high.

it's a quiet holiday on the campaign trail, but as julianna goldman reports, not a completely silent night. >> reporter: on christmas eve, donald trump attended midnight mass, a service wishing peace and good will to all. its limits. in a string of twitter attacks, the republican front-runner took credit for the obama hundreds of illegal immigrant back to central america, ridiculed jeb bush, and said, "i look forward to running against hillary clinton, a totally flawed candidate, and beating her soundly." trump has used an unconventional playbook to dominate the race with insults and controversies. he's remained on top without pollsters or a single tv ad. some cracks may be showing in iowa, where ted cruz is ahead by nine points in the latest cbs news poll. the texas senator spent the last week on a multistate tiewrk complete with a santa at every stop. but it's possible that polls are underestimating trump's support. a study earlier this week found he performed six points higher when people were polled online very over the phone with a person on the other end. one reason-- voters ma

now, as julianna goldman shows us, a fitness ipstruck thor in ohio is offering classes on how to fight back. >> running's not off the table. running is always the best joyce. >> reporter: aaron jannetti runs endeavor defense and fitness. tonight he's holding a free >> right now there's a big buzz going around in the wake of paris and san bernardino, things like that. >> reporter: since the recent terrorist attacks, demand has skyrocketed. >> we filled a january course that's going to be coming up here in a couple of weeks, 40 people already, and i have a wait list about 20 more. >> reporter: amid heightened fears of terrorism, and mass shootings making headlines just about every day, jannetti's course outside of columbus, ohio, is one of many being offered across the country. as the year draws to an end, mass shootings are weighing heavily on people's minds. a new poll shows that 68% of americans listed mass shootings in the u.s. as very or extremely important news events this year. linda gause was among the nearly three dozen participants earlier this week who spent the majority of th

julianna goldman is in manchester to sort it all out. >> reporter: with one side charging theft and the other alleging favoritism, both campaigns set the stage for what could be a fiery debate. >> obviously, it was totally unethical to steal our data. >> reporter: clinton campaign manager rooby mook said they still don't know if the sanders campaign kept the voter data they accessed earlier this week. >> they've now agreed to have an independent odd toit make sure they no longer have any of our explanation of what their staff did. >> reporter: sanders' campaign manager jeff weaver focused his fire on the d.n.c. for temporarily cutting them off from their own voter files. >> the decision of the d.n.c. chair woman to issue a death penalty to the sanders campaign is a real concern. there is no data we are aware of that is in the possession of our campaign or the possession of any of our staffers. >> reporter: sanders and fellow democratic candidate martin o'malley have long argued the d.n.c. has favored clinton. but until this later controversy, the democratic race has largely premaind civ

julianna goldman in washington tonight. thank you. on the republican side, another candidate quit the race today. and new jersey governor chris christie is making a move in new hampshire. major garrett has been spending time with christie in the granite state. >> i ask for your vote, for your trust and for your confidence. >> reporter: this town hall in pelham was chris christie's 41st in new hampshire. since the terrorist attacks in paris and san bernardino, shift in anxiety. 75% of his questions now are about terrorism, triple what they once were. >> as politicians we need to be responding to that fear. >> reporter: we rode on the christie bus and asked if fear can get the best of people? >> i don't think that we should be afraid of people because of what religion they practice. >> reporter: or how they look? >> of course. that goes hand in hand. what you need to be fearful of is not having enough intelligence to know the difference between a jihadist and a peaceful muslim. >> reporter: how do you do that? >> you first of all ramp b

here's julianna goldman. >> i love you, too. >> reporter: hours before a bruising poll showed donald hrump losing steam in iowa, he was in south carolina, taking on the e.p.a., gun control, and his proposal to bar muslims from entering the u.s. >> we don't want people coming in and knocking down world trade centers and having what happened last week in california. >> reporter: last night, he took aim at ted cruz in iowa, where some polls show the texas senator in first place and where religious conservatives dominate the republican caucuses. >> i do like ted cruz, but not a lot of evangelicals come out of cuba, in all fairness. >> reporter: saturday's poll shows iowa evangelicals overwhelmingly backing cruz. the two have played nice during the campaign but not so nice since these off help camera comments came out this week. the "new york times" obtained audio of cruz at a private fund- raiser saying he was the electable conservative who could take on the establishment, not trump or ben carson. >> reporter: today, trump acknowledged the gloves are coming off. >> we've had a very good

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julianna goldman, cbs news, washington. >> coming up. a report accusing peyton manning from using human growth hormone. can't tell the story but we will, when cbs news continues. faf faive la faf la, facility la la, favela, favela, >> glor: today, peyton manning fiercely rejected an allegation that he used human growth hormone while recovering from a career-threatening neck injury four years ago. the claim was made in a documentary by the al jazeera network. jericka duncan has details. able to use but it really makes me sick. >> peyton manning won the >> reporter: peyton manning won the mvp award a record 5 times. he comes from a family of nfl quarterbacks. the 39 year-old has built his career on hard work. >> in my 18 years of playing in the nfl. there are no shortcuts. >> reporter: but in a new documentary on sports doping, by the al jazeera network , hidden cameras capture a man named charles sly, claiming the mannings were receiving banned human growth hormones in 2011. >> all the time we'd be sending ashley manning drugs. like all t