Check out the difference between what Zogby reports on his own site re: post-debate polling and what he reports to Reuters:

http://www.zogby.com/news/ReadNews.dbm?ID=1596

"The debate appears to have had only a little affect on likely voters nationwide."

http://www.reuters.com/article/politicsNews/idUSTRE49G0V320081018

"Today was the first full sample post-debate and there's a clear indication that McCain is moving up."

Keep in mind what we're talking about is a .7% move up for McCain and a .9% move down for Obama, putting the race nearly exactly where it was two days before the debate. In reality, the worst you could say is that Obama's post debate bounce has dissipated.

I guess the horserace moves units.