From Forbes:

"Obama vs. McCain: Early Results

Winning a debate is no guarantee that a candidate will win an election, and online polls open to all comers are flawed at best. That aside, as of last read, and with over a quarter of a million responses, Barack Obama leads John McCain 51% to 35% in response to a post-debate MSNBC poll on who won tonight's contest. Only 6.4% respondents agreed with my earlier assertion that the debate was basically a wash.

Obama is already ahead of McCain in national polls and in the electoral college forecasts, but he'll need to keep working hard; under some scenarios, John McCain could come out ahead by taking just a few strategic states in which he's polling close to Obama.

–Steve Kichen"