She isn’t completely DOA, but she’s in an even worse position than Heller, which is sayin something.
I agree. Heitkamp still has a chance of winning, but it is definitely less than 50% at this point. Probably around 30% or 40%, taking the national environment into account. If only one incumbent Democrat loses in 2018, it will be her. McCaskill and Donnelly aren't completely out of the danger zone yet however, but their odds of winning are higher than Heitkamp's.
Heitkamp will probably lose by mid single digits, ~4-6% or so. Her loss will complete North Dakota's realignment into a solidly Republican state at all levels. Democrats, I believe, are done for in most of the Mountain West, and will be for decades to come.