How would you grade polling firms. (For me shocking inaccurate)

[Pericles]

Overall polling is reasonably accurate, even in 2016 the polling error was not unusually large it was more that the pundits misinterpreted the data and were overconfident about Clinton's chances.

Primaries are hard to poll, especially early on and with so many candidates-there are tons of undecideds. Iowa polling also should be judged on the first alignment results, Bernie's winning margin there of 3.4% is almost exactly the same as his margin in the polling average of 3.7%-the main difference is Buttigieg did a bit better and Biden a bit worse than the average said.

So grade B I guess, I'm not sure what a B means to other people but to me it means they are pretty good but still have room for improvement.