A more often heard theory at the time, that I ever heard expressed by liberals from the MSM, was that either their methods were failing to accurately count conservatives, OR that conservatives, due to the dangers of being identified as conservatives in today's America, were habitually avoiding or lying to pollsters.
If that popular theory was true, then one could expect that the polls numbers for any republican would remain artificially low, until the problem was fixed, which we had no reason to believe had happened.
Leaving all of this out of the op linked article, turns it's talk of "alternate reality" on it's head. It is you liberals who need to pretend that your enemies have no valid reasons for their beliefs or actions, and that only you are justified in,
well, everything.
And it is telling that you have similar beliefs for EVERY significant issue. EVERY time, there is a narrative given to you, that explains why your way of thinking is the ONLY POSSIBLE way of thinking, unless one is a "bad person" or a "Wacist" or some type of "phobe".
You are the ones who have retreated to a fantasy world, where you are always right and never lose, not legitimately.