All that is necessary for the triumph of evil is that good voters do nothing.
There is a wide-spread misconception, fueled by the so-called "mainstream" media (MSM), about the actual significance of the election polls. Regardless of whether the polls are accurate or not, they do not measure, generally, what they purport to, that is, the preferences of the likely voters when they will have to choose between Donald Trump and Hillary Clinton.
What the election polls do measure is how the American public reacts to the massive out-and-out anti-Trump pro-Clinton propaganda that they are exposed to about every time they turn to MSM for the news. The polls are, de facto, multiple-choice tests that the respondents take after being lectured on whom to oppose and whom to support. They provide a valuable feedback information to the MSM propagandists that tells them which tricks work and which do not. They also constitute an effective tool with which to manipulate public opinion since many prospective voters want to go along with whatever they perceive as the mainstream. It is a vital part of an effective command-and-control structure run by the hostile ruling clique and its useful idiots; the latter sometimes referred to as the "intelligentsia" - college-educated professionals with leanings to the Left.