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Presidential candidate Bernie Sanders is coming under fire from the Clinton campaign and much of the liberal base for referring to Planned Parenthood, the country's largest abortion provider, as an "establishment" organization.

In Iowa Mr Trump also leads, but his edge over Mr Cruz is small - 28.8 per cent of support, to Mr Cruz's 26.6.

He added that Democratic front-runner Hillary Clinton was beatable - but not for Cruz. Dole, however, expressed concern about the possibility of Cruz getting the nomination, and said he felt Trump was the best chance the party had of avoiding a Cruz candidacy.

Cruz has acknowledged failing to disclose to a federal campaign agency loans from Goldman Sachs and Citibank for his 2012 Senate race - although he did list them on a separate Senate form.

"I could care less" about Palin's support for Trump, said Scott Heckart, 49, who said he had made up his mind to caucus for the billionaire businessman and former reality TV star.

According to the same poll, Sanders outperforms Clinton in head-to-head match-ups with top GOP presidential candidates in New Hampshire.

"I can talk personally about this, I guess it is kinda the elephant in the room because my own family is going through", Palin said. Reporter: Police arrested track for allegedly assaulting his girlfriend and also threatened to shoot himself with an Ar assault weapon telling the crowd he's coping with PTSD tying his troubles to a president she says neglects veterans.

"Sarah Palin just guaranteed Trump the evangelical vote because I think she was speaking in tongues", Colbert said.

"And it makes me realise more than ever, it is now or never for the sake of America's finest that we'll have that commander-in-chief who will respect them and honour them".

Trump said he thought it would be appropriate for Palin to address the incident.

The CNN/ORC International poll released Thursday has Sanders polling at 51 percent among likely Democratic caucus-goers, while Clinton sits at 43 percent. "It's a shame that our military personnel even have to question, have to wonder if they're respected anymore", the former Vice Presidential candidate said.