Huntsman served under Reagan, Bush Sr. and Jr, before he served under Obama. That makes him a public servant.
His days as a Republican ended when he did that.
You people keep forgetting that the original RINOs were all Democrats who were not satisfied with working through the Democrat chairs to get to higher office ~ they wanted it now, and you could do that in many places by running as a Republican.
Deals were made.
This more modern use of describing Leftwingtards as RINOs doesn't apply in all cases, or even in very many cases. We used to call them Rockefeller Republicans or Eastern Republicans.