Microsoft Xbox, working in partnership with the the polling company YouGov, conducted a live poll among more than 30,000 respondents who tuned in to watch the debate and answered survey questions via Xbox Live's election channel.
The Xbox sample was neither randomly selected nor scientifically projective of any larger population, and the adult participants skewed heavily younger and male.
However, the sheer size of the participant pool allowed the Xbox/YouGov pollsters to isolate 988 respondents who said they were completely undecided before the debate, and they judged Obama the winner by a 51 percent to 17 percent margin. After the debate, most remained undecided, but 28 percent said they now will vote or lean to Obama, while just 10 percent said they will vote for Romney.
http://www.huffingtonpost.com/2012/10/17/presidential-debate-polls_n_1972357.html
