Ideally you would look for a poll to be conducted by a trusted, unbiased party. I'm giving this poll the benefit of the doubt on being accurate for the sake of the conversation, but if the claim is being made that the it's influenced by mob mentality then I would suggest the poll is not valid in this case.
Assessing Poll Validity
There is no universal rule to determine what makes a poll ‘valid.’ However, all public reports of survey findings should include reference to the following:
Sponsorship of the survey
Dates of interviewing
Method of obtaining the interviews (in-person, telephone or mail)
Population that was sampled
Size of the sample
Size and description of the sub-sample, if the survey report relies primarily on less than the total sample
Complete wording of the questions upon which the release is based
The percentages upon which conclusions are based
The key things to look for are sample size and corresponding margin of error (be cautious of results when the margin of error exceeds 5 or 6 points); whether the sample was scientifically chosen or whether respondents were self-selected (typical of ‘900’ call-in polls and many web-site polls); and the wording and order of the questions (look for questions that seem to ‘push’ the respondent to an answer by describing some options more attractively than others).
More information is available in the short publication Twenty Questions A Journalist Should Ask About Poll Results by Sheldon Gawiser and G. Evans Witt. The pamphlet is available from the National Council on Public Polls or using the link below.
polls aren't always accurate, and polls and poll questions can biased or aimed/phrased in a certain way to achieve a certain result...and polls can be manipulated...robots can and do influence poll results. Even RCP polls are wack sometimes.
Just my 2 cents...but hey, we can always take a poll on it.
Also, polls can sometimes have an influence on voter turnout...and quite possibly helped Trump in 2016. And just for spite, some people purposely doesn't give an honest answer to poll questions.