All polls are getting less accurate. Fewer people have land lines, and fewer of those answer their phones. And they tend to be older people. Polls give you a broad picture, that’s all. Trump seems to have about a quarter to a third of the primary voters at this time. Whether it shows more towards one end or another probably just has to do with that particular sample, not any real movement. But over time if they all show the same pattern, it’s probably real.
Fewer people have land lines, and fewer of those answer their phones.
******************
At one point in time that may have been a factor in polling accuracy. Damn near
everybody has a cell phone and that is becoming the easiest way to contact people.
The pollesters have to learn to adjust and I think they are doing it.
They're becoming more like art and less like science.