However PEC did note the following in the earlier article:
"In the same study, however, when subjects were asked to imagine their reaction if the evidence had pointed to the opposite conclusion, they were more open-minded to information that contradicted their beliefs. Apparently, it pays for consumers of controversial news to take a moment and consider that the opposite interpretation may be true."
They didn't explore this further though, because not everyone is likely to be more open-minded about non-supportive data. Recall some of the studies I previously sent, like this one that said: "When faced with a conflict, liberals are more likely than conservatives to alter their habitual response when cues indicate it is necessary" (source, #15).
So poll bias is not the same for PEC and 538 as it is for conservative poll spin, since the former are more capable of being open to contradictory data and in fact include it in their calculations.* Given that inclusion it is all the more reassuring that Obama's odds are so high compared with typical media hype having it so close based on their own generally unconscious biases to making it an exciting horse race above all else.