Marist is usually a good pollster, no?
Ask Sen. Donnelly and Sen. McCaskill.
Marist's final polls had McCaskill at 47% (she got 46%) and Donnelly at 45% (he got 45%).
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They were still wildly off margin wise. Also, if a Candidate gets a lower share of the vote than your polls show (like with McCaskill) then theirs something wrong with your polls.
A 1% lower share is utterly insignificant statistically.
Being off margin wise doesn’t matter so much if you have a candidate over 50%. Trump could get all the undecideds and still lose.