Eh? All the polls basically said "we don't know, either can win", maybe followed with "X is slightly more likely to win".

Also note that a "90% / 10% change to win" is not necessarily "wrong" if the 10% candidate wins. Anyone who has played an RPG will tell you that 90% chance to hit is far from certain. Maybe if there had been 100 elections, Clinton would have won 90 of them.