http://www.cnn.com/2004/ALLPOLITICS/10/06/debate.main/
"According to an ABC poll, 43 percent of registered voters said Cheney won, 35 percent gave the win to Edwards, and 19 percent called it a tie. Thirty-eight percent of the viewers were Republicans, 31 percent Democrats, the rest independents. The phone survey was conducted among a random sample of 509 registered voters who watched the debate.
CBS News' poll specifically focused on uncommitted voters and found 41 percent deemed Edwards the winner, 28 percent chose Cheney, and 31 percent said it was a tie. CBS based its poll on a "nationally representative sample of 178 debate watchers ... who are either undecided about who to vote for or who have a preference but say they could still change their minds.""
I tend not to like the CBS poll. The ABC one has more people that were polled, and you can actually see how many people really did lean a certain way, and how many of the independents each party gained. The way a poll is taken makes a huge difference on the results.