Rep. Jason Chaffetz, who worked as Gov. Hunstman's chief of staff, has endorsed Romney over his former boss according to this LA Times article:
"It was a little difficult," Chaffetz said. "Jon Huntsman is a good man, but when your goal is to beat Barack Obama I just think Mitt Romney is in a much better position to do that. He's laid this foundation for years. He's got a wonderful organization, the ability to raise the type of money [needed]. And I just think he's going to make a great president. I think we need that type business background to get our economy back in shape."