Ah, I see now the emphasis you were going for in your original note. Polls estimate voter sentiment, prediction markets estimate odds of winning.
Discussion
Yeah to be fair there is something implicit, i.e. that the prediction is 'who would be president', or more generally, a binary outcome, not 'what will be the final distribution of votes as a percentage'. I don't know how prediction markets for outcomes like that work, it's obviously more complicated then.