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.
They admitted that the poll numbers being reported on CNN do not include early voters. Read this link:
http://www.usatoday.com/news/politicselections/nation/polls/usatodaypolls.htm
Once a person votes early, Gallup does not count them in their likely voter results.