From Pew Research Center [PDF]:
Among registered voters, Romney gains 9 points. Among likely voters, Romney gains 12 points.
Mitt Romney no longer trails Barack Obama in the Pew Research Center’s presidential election polling. By about three-to-one, voters say Romney did a better job than Obama in the Oct. 3 debate, and the Republican is now better regarded on most personal dimensions and on most issues than he was in September. Romney is seen as the candidate who has new ideas and is viewed as better able than Obama to improve the jobs situation and reduce the budget deficit.
Fully 66% of registered voters say Romney did the better job in last Wednesday’s debate, compared with just 20% who say Obama did better. A majority (64%) of voters who watched the debate describe it as mostly informative; just 26% say it was mostly confusing.
In turn, Romney has drawn even with Obama in the presidential race among registered voters (46% to 46%) after trailing by nine points (42% to 51%) in September. Among likely voters, Romney holds a slight 49% to 45% edge over Obama. He trailed by eight points among likely voters last month.