Everyone claiming that polls or forecasters were wrong should really do their homework and think what 'forecasting' is all about. It is not about predicting future with 100% certainty. It is about calculating odds of outcomes. You can calculate odds of Trump winning and put them at 40%, you can put them at 1% or 90%. In neither of cases you are wrong or right when he wins. Odds of winning are not 'verified' in any way. If you say that there is 50% chance of coin flipping on tails you are not wrong when it flips on head.