Or Democrats would be in for a rude awakening on Election Day when people like McCaskill and Donnelly survive and they gain AZ and NV but ND is too red for a Democrat like Heitkamp to win.
There's no way they'll lose in ND if they're winning in IN, MO, MT, OH, WV, etc. Quite frankly, I doubt Heitkamp would have lost even in a Clinton midterm (though it would have been Tilt/Lean D instead of Likely D - maybe Tossup in a big wave), she's an incredibly talented and charismatic candidate. States like MT and ND behave differently in down-ballot races, and there's a reason why Republicans are struggling to win Senate races in those states.
I actually thought Heitkamp and Donnelly were prime candidates for defection under Hillary.