National and local news organizations will be conducting online polls during and after the debate asking for readers' opinions. Look for online polls at these national news websites, and make sure to vote in every one of them:
(upper right corner)
(halfway down on right)
(to the right of the US map)
EDIT: i'm having a helluva time finding these polls. so far, i've only been able to locate the one on msnbc.
here's one more.