"When you're only going to poll the most likely of voters, you're going to have Republican bias," Greenberg said. "The presumption going into the election was that Bush won the election."
She added that overt and widespread one-upmanship among media networks only exacerbates the problem of misinformation, encouraging journalists to sacrifice integrity for speed.
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"There are only two polls that got it right," Greenberg said. "Every single network is based on the same information and they're all in competition with each other."