Truly random doesn't exist. Theoretically random does.
I think we agree on this part, true randomness is excruciatingly difficult, if not impossible, to obtain. There are certain things that could skew it. There is the famous example of phone polls calling an election for the candidate favored by the wealth, who were the only ones who could afford phones at the time. A pollster who cares about significant randomness must call upon segments of the population in a manner that does not tend to select for or against particular demographics.
Normally they post, in their full report, things like "number of females/males", ages, or political leanings
But this isn't really necessary for randomness is it? If a poll is set up in a way to minimize the selectivity of the sampling, then this is not necessary. Also, when they give those numbers, they don't always tell you the proportions of those demographics.
Besides, if you go around actively selecting to fill in a quota of demographics, then you do not have randomness.