As someone who works with historical documents, I often come across pieces that remind me that the more things change, the more they are the same.
In 1940, FDR was running for an unprecedented third term. Republicans attacked him as a tyrant, who was destroying the democracy, going against the clear wishes of the Founding Fathers and a SOCIALIST. Their main thrust was that the New Deal was a failure and needed to be repealed. Sounds familiar so far.
Polls were less pervasive then, but a Gallup poll showed support for Wilke. In the above article, the DNC chair attacks Gallup as deliberately favoring Wilke. Gallup denies it. Note that this is Nov. 1, 1940, just days before the election. FDR goes on to get 55% of the vote, which was a blowout in the Electoral College. Still, 45% of the voters did not want Roosevelt and even WWII would not bring some of them around (like one of my grandfathers).
So 70 years ago, pollsters were attacked, though maybe more deservedly so. The business was in its infancy and would get Truman/Dewey wrong twelve years later.