They exist. Campaign management may not release their results even to the campaign staff, but they have to know the truth. That's most of what I did for a living, and I always reported accurate results to the best of my ability. I included the uncertainties, not just the classic statistical uncertainty but also in my assumptions.
My experience is mostly with pollsters and campaign staff in IL, and with CLI types. They were as I describe most of the time. They have a motivation to present the race as close and winnable ... if only the donors will give more money.