Greenberg focus group time (undecideds in Colorado):
http://www.time-blog.com/swampland/2008/10/they_liked_him_they_really_lik.html
The voters awarded Obama the win (38% to 30%, with the rest choosing no clear winner). But that result was actually the least useful of the evening. Because while the earlier debate did not result in any net change in support for the two candidates, Obama walked away with a clear lead in new voters tonight. After the debate ended, 26% of the audience had become McCain supporters while 42% said they planned to vote for Obama. Only a quarter of the group was still undecided.
Even more dramatic was the shift in the voters personal reactions to the two candidates. Before the debate, McCain had a 48/46 favorability rating; that improved to 56/36 by the end. But thats about where Obama started the evening54/36. After an hour and a half, Obamas favorability numbers were 80/14. As Joe Biden would say, let me repeat that: 80% of the undecided voters had favorable views of Obama and only 14% saw him negatively for a net rating of +66. Not even Bill Clinton got such a warm response in town hall formats.
Obama also improved his standing on several key attributes. Only 38% of voters thought he has what it takes to be president before the debate but by the end he had convinced more than half the room (56%).
http://www.time-blog.com/swampland/2008/10/they_liked_him_they_really_lik.html