From twitter, first CBS:
BREAKING: CBS NEWS INSTANT POLL Who won debate? OBAMA: 37%; ROMNEY: 30%, TIE: 33%
Obama's winning our post-debate snap poll in Colorado. We should have full results between 11:15 and 11:30
No idea about the sample from CBS. In past years the snap polls were of everyone, not just undecided (which at this point means people are lying)
It is really important to note that media consensus often changes these results. In 2000 and in 2004 the initial impression was changed in the next 48 hours.
Personally, I think the Libya exchange might have the same effect as the Kerry mention of Mary Cheney in 2004. Romney got killed in the moment, and the impression I think will spread.
FWIW I thought Obama killed it tonight.