http://www.usatoday.com/news/politicselections/nation/polls/usatodaypolls.htm
From Gallup:
1. (Asked of those who have not already voted) Now, suppose that the presidential election were being held today, and it included John Kerry and John Edwards as the Democratic candidates, George W. Bush and Dick Cheney as the Republican candidates, and Ralph Nader and Peter Camejo as independent candidates. Would you vote for:
1-1. (Asked of those who already voted) Who did you vote for in the presidential election?
"^ Beginning with October 22-24 poll, those who indicated they had already voted were asked who they voted for rather than who they would for if the election were held today."
The numbers being reported are for question 1. They are not reporting Question 1-1.
You really think Gallup would exclude from aggregate poll numbers those that have already voted? Give me a break. The odds of that happening are zero. Zero. You can write that down.